We’ve got you covered… the only IDEX California® prep class offered in two ways!

Register Today!

It is truly the ORIGINAL and the most
reliable way to prepare for the IDEX California®.

The Original IDEX CA Prep Class© is inclusive of all of the content on the exam.  It is self-contained and does not require supplemental books and information.

  • Taught by practicing professional instructors.

  • Developed by a member of the IDEX California® Task Force.

  • Focuses exclusively on the areas tested upon in the IDEX California®.

  • Incorporates learning reinforcement techniques.

  • Includes comprehensive lessons and quizzes.

  • Formats quizzes in the style of those in the IDEX California®.

  • Offers all-inclusive course review handouts.

  • Extends study time for on-line class until the end of next testing month.

  • CCIDC grants ten hours of credit (1 CEU) for current Certified Interior Designers.

Quiz Questions
Bonus Review
Pages of Handouts


  • Offered in No & So CA
  • Pre-printed handouts
  • Traditional learning environment
  • Interactive Q&A
  • One or two day classes


  • 24/7 Access
  • Downloadable handouts
  • Learn at your own pace
  • Contact instructor by email or phone
  • Access through the next testing month


  • Both in-person and on-line classes
  • Efficient study process
  • Printed and downloadable handouts
  • Redundant learning reinforcement
  • Easy access to instructors
Register Now!


This option is designed for previous Original IDEX CA Prep Class© enrollees who have delayed their exam registration beyond the valid class ending date and would like to repeat the class.  The reduced cost for this is $99.  For more information email mollyanne@macdesignstudio.com with your request.

CEU Opportunity for Current CIDs

Certified Interior Designers may enroll in the in-person or on-line Original IDEX CA Prep Class© and obtain 1 CEU (10 hours) to fulfill a 2-year requirement for CCIDC.  For more information email mollyanne@macdesignstudio.com with your request.

“Valuable Guidance at Every Step”

“Thank you so much for your valuable guidance at every step. I could not have done this without taking the class and the immense
knowledge you shared with me during and after class…THANK YOU!” – Priya Chawla

“I am thrilled I selected YOUR program over the others! I was so thrilled when I realized that I achieved the highest score on this latest exam and I must attribute my success to YOUR online class!  Thanks Again!”

Barbara Hordyk

“Short Lessons that I can complete quickly and effectively are important.  I am a working mother and it is hard to carve out time for studying! This was key. The Bonus Quiz made studying fun for me. I logged my progress and watched my score improve step by step (12th time was a charm).”

Monique Blais-Algie

“I am very glad I took this course.   The given study guide for the IDEX through CCIDC is very extensive and overwhelming.  This course did a great job of presenting only relevant information.”


Taylor McGrady

“Your course thoroughly explained answers and helped me be well prepared. Last week I found out that I passed after taking it for the first time! Thank you for your time and accessible resources.  I couldn’t have passed without your help.  I definitely recommend your online course to those that are seeking to pass the first time.” 

Kacie Young

“I loved how the lessons were divided into manageable chunks, and it was nice how there were shorter lessons after the heavier more intense lessons.  The lessons were well-written and easy to understand as well.  Then when I had some questions, I appreciate how you were so quick to respond.”

Abby Ganih

“The review sections after the quiz are excellent to reinforce the information.  It’s incredibly helpful.”   Natalie Zudin

This is the best study materials ever.”   Benjamin Norouzi

“I would say repetition is the motherhood of learning…and you can take the quizzes for each section over and over. I went through the review at least 5 times. It was written well. It was easy to follow and understand. The way it was organized was helpful.”   Deborah Minarik

“I enjoyed the short and concise lessons. It helped me structure my study plan throughout the week.”  Lauren Wagner

“The content of this course was all very informative, but above all, lessons were straightforward & concise. This made it easy to study after work or when I had some spare time throughout my day. Quizzes were extremely helpful in absorbing all the info covered in each individual lesson.”
“The class helps to organize the study process and in conjunction with the In person class it reinforces what you need to know and study.”    Gabriel Castillo

“Thank you for your class and it’s resources, they proved valuable in my passing.”   The class was “easy to read, concise, no nonsense way to learn the required information.”   Melissa Wright

“The most helpful part of the class was the quizzes that took place at the end of each presentation.  Also, the handouts were very helpful to review and study.  Being able to go through the entire class a month before the test helped me tremendously.”    Gabrielle Garcia

“…I would not have been able to pass the IDEX without taking the class!”    Phyllis Dawson

“The most helpful part of this class is “the quizzes that reinforced your learning and that you could go back and keep re-testing to reinforce your memory.”   Penny Tillema

“Everything you need for the exam.”   Yixin Chen

“Summarized all key information for each chapter, easier to understand.”    Mengmeng Chu

“… this class gives you ALL the information you need to pass the exam.”    Kathy Ho

“The Original IDEX CA© Prep Class “targets all aspect of the exam.  It explains so well about each section.  Thank you very much again Carol, for your class and guidance!  I passed the IDEX exam the first time!  Thank you very much for your great guidance and thoughtful study material!  It gave me so much confidence!”   Trent Yuan

“Perfection!”  Rober Khalil

“Take (this class) earlier the better before you start studying.” Kat Waller

“Great overall course to understand what is needed to pass.”  Lisa Ross

“It’s a great class.  Must take prior to exam.  Carol clearly defines what will be on the exam.”  Maribel Abrica

“It is all you need to know for the test.”  Laura Downing

“I am very glad I took this course. The given study guide for the IDEX through CCIDC is very extensive and overwhelming. This course did a great job of presenting only relevant information.”   Taylor McGrady

“Lovely to hear that everyone who attended your online class passed. Congratulations to you for creating an informative class. The ease of going back to study and reinforce some of the information was crucial to the learning process.  I would tell my colleagues that this class is “A necessity if taking the IDEX Exam.”   Meera Chawla

“The class helps to organize the study process and in conjunction with the in-person class, it reinforces what you need to know and study.”   Gabriel Castillo

“Best way to pass the IDEX because the information is very organized and succinct.”   Zainab Anwar

“Thank you very much.  I really appreciate you offering this course!  It has been a great resource.”  Taylor McGrady

“If you are going to become an interior designer working on your own or want to become certified, TAKE THIS COURSE!”  Louis Washington

It’s a helpful overview of design concepts that helps to give confidence to take the exam.”  Amy Sutton

“Thank you for helping prepare me for the test…  I don’t think I could have done it without you.”  Jim Madsen

“The class gave me a better understanding of what I needed to focus on.  I will definitely recommend your class.”  Phan Chun

“I need to thank you for helping me prepare for the exam.  Having re-entered the design world after a long hiatus just the thought of the exam was daunting!  But I learned a lot of facts that I would not have known if I hadn’t prepared for it, and again I am thankful to you.”  Mahsati Tsao

“I just wanted to let you know I passed the IDEX!!!  I owe a lot of it to your class.  Thank you for all of the help!”    Connie Simvoulakis

“Short Lessons that I can complete quickly and effectively are important. I am a working mother and it is hard to carve out time for studying!  This was key.  The Bonus Quiz made studying fun for me.  I logged my progress and watched my score improve step by step (12th time was a charm).”   Monique Blais-Algie

“After taking the test, I felt like the class definitely covered all the material thoroughly.  I ordered a couple other reading materials which had sample questions and found that those were completely irrelevant to the test.  It was a waste of time and money looking over those materials.  I wish I had focused more on what the class had provided and covered on-line and in-person.  The class was so clear in breaking everything down and the in-person class helped a lot more to clear up any questions that I had going through the on-line portion.  I would recommend this class for any person taking the test.  Thank you so much for your help and support.”   Amy Waldner

“Amazing handouts and abundance of information.”   Natalie Grebe

“I loved that there was a quiz after each lesson and that there was information to support the correct answer.  I also appreciated the diagrams and the written explanations below them to help me understand how they would be put into words.  Your IDEX prep class proved to be extremely helpful and I am so grateful!  I will definitely recommend your class to anyone who is preparing for the IDEX!”  Kendall Marsh

“Just wanted to send a note of thanks for all your effort in helping me study for the IDEX exam. I felt prepared and you were a huge encouragement throughout it.”  Danielle Calbeck

“I took my test yesterday and I wanted to just say thank you!  I believe your prep course was a big part in the reason I feel I did so well.  There’s was not a question that had content I did not study at some point.”  Janel Willoughby

“As a general note, I am very happy I chose your program.  I like that it is so structured and digestible.  The mini-tests are an invaluable way of looking at the material in the way I will need to recall it during the exam.  Thank you for offering this wonderful prep class and for your responsiveness to my questions.”  Amy Hoffman

“The prep class really distilled down the information to allow me to concentrate on what was important.  Thanks so much for encouraging me to do the online class, it was a great way for me personally to prepare.”  Marci Krause

“Carol, I passed!!!  Many thanks for the help!”  Sandra Burga

“Thank you very much for all of the additional information you sent out to us this weekend.  Your course instruction has been a huge help already.”  Kara Rice

“I got an email notice from CCIDC that I have passed the IDEX exam in Oct.  I really appreciate your encouragement and assistance.”  Kate Handwerger

“Thank you Carol!!! So thankful for your class.”  Laura Reisiger

“Thanks for your materials.  I’m really glad I passed it with studying in such a short time!”  – Kandy Chang

“Thanks for the website.  I was able to navigate through the website very easily.  It had all the information one could want or need and seemed to answer all the questions one would have.  The links were easy to navigate also.  I thought the Class Guide was informative, and the on-line version seemed like it would really be a piece of cake to follow!  Thanks again!”   Emily Mitchell Grosz

Thank you so much for everything, the class was wonderful.  The time zoomed by and you kept it interesting and entertaining.  Thank you!“  Garry Tomason

“An excellent class & refresher.  You did an amazing job, very knowledgeable and most importantly you know your craft very well.  How I wish I took your classes in design.“  Arcel Punsalang

“I just got news yesterday that I passed the IDEX exam. I wanted to personally say Thank You.  After attending your class, I was much more confident in knowing that I could pass the test.”  Bree Klipfel

“I just received word that I passed the IDEX exam!  Thanks to your course I was able to do it!!”  – Leora Cane

“Very valuable class!”  Jim Vivrette

“Don’t take the test without taking this class!”  Carole Hedstrom

“Even if you don’t want to become CID, the class gives you the basics to become a more competent designer.”  Shirli Yazaki

“I would recommend this class as a great refresher course, as well as IDEX prep.”  Kim Stone

“Take this class, it is very helpful since the professor goes over specifics that are on the actual test.  If you think you are prepared for the test, you will realize what you need to focus on and what you shouldn’t.”  Karina Mendez

“Informative class, refresh memory about all of the aspects of interior design (codes, business plan, ethics, etc.).”  Melissa Budirahardjo

“Best way to prepare for the exam & a good review of codes & business practices.”  Karen Fakouri

“Carol is very knowledgeable & really cares that we pass the IDEX. Great examples/stories.”  Stevie Larabee

“The content was test specific, removing unnecessary and overwhelming recommended study information that made me overwhelmed.”  Janel Rodriguez

“Great presentation with info for reference in a summary format.”   Laura Jane Muszynski

“Demonstrated with examples from actual experience.”  Margaret Kemp

“Well worth time and expense… great resources.”  Mary French

“The handout (from the class) is worth it’s weight in gold!”   Alexis Salsow

“Very informative and inclusive.”   Alisha Kozlanski

“Very thorough – great overview.  Now I have some direction.”   Nicole Federico Martinez

“Great, informative, fully impacted!”   Martha McGowan

“Presentation material is well-organized.”   Yukari Haitani

“Concise information, narrowed down to most important, relevant aspects.”  Richa Somani

“Very informative and clear presentation.  Helps simplify ALL the details.”   Tiffany Mount

“Excellent review of what topics are important to focus on while studying the vast amount of information covered!”   Emily Koch

I “recommend that they (designers) take this class before taking IDEX.”   Patricia Brown

“Well organized, very interesting, well presented, great material.”   Elaine Hall Murray

“It (the class) really breaks down what you need to concentrate on and clarifies questions.”   J. Michele Preston

“Absolutely!  This was an extremely well laid out review course focusing on the elements of the exam that I’d never be able to get through on my own.  Very thorough.”  Kori Kintsch

“I would never consider taking this test if I didn’t have this class.”   Meagan Boen

“Must-take-prep class before taking the test.”   Angela Rasmussen

“Excellent summary, very concise.  You’ve got to take this class.”   Rosana Zacaria

“A must for preparing to take the IDEX.”   Brian Lind

“The depth of knowledge that was presented was excellent.  I feel more confident about taking the test.”   Abigail Kennedy

“Helps to streamline what you need to know.”   Debbie Costa

“Going over the tables really helped me grasp the content and understand the purpose of the information.  The manner in which the material is presented calmed my fears about the overwhelming amount of information, and focus on conceptual understanding and logically approach the test.”   Jaymi Retzlaff

“Best and most efficient way to prepare for taking the IDEX specifically.”   Melina Copass

“The class was “excellent!  I feel totally prepared for the IDEX.”   Stephanie Swindell

“Focused, informative, highly recommended.”   Cecilia Gonda

“This class is “A must to consider yourself a true professional.”  Dorian Bolick

“Informative, time passed quickly, instructor was prepared.”  Susan Brydon

“Extensive and it is beautiful to have a live person to ask about anything.”   Rosendo Prado

“This class was helpful in being able to improve the way I run my business and reviewing codes I had forgotten about.”   Marisa Miller

“Good, a lot of information.”   Miriam Tinajero

“It’s a great overview of what will be on the IDEX exam.”   Sean Kim

“Thank you so much Carol! I enjoyed our classes, and I really appreciate all the great information you have shared with us.”    Myrna Vasquez

“Thank you Carol. Your seminar yesterday was great.  You shared so much valuable information.”   Patty Spielberg

Do Not Wait – Start Now!

Still have questions?

View FAQ’s Now

The IDEX California® is the only state approved exam for Interior Design Certification.  The Original IDEX CA Prep Class© by Carol Lamkins, CID, CMKBD, is the top-rated preparation class to get ready to sit for the IDEX California®.  This class is exclusively sponsored by the California Legislative Coalition for Interior Design (CLCID) with the profits supporting the profession through legislation.

The Original IDEX CA Prep Class© was developed at the request of the California Council for Interior Design Certification (CCIDC) with the stipulation that the prep class cover everything on the IDEX California®.  This commitment was met as the author is a member of the IDEX California® Task Force that developed the IDEX California®.  The first biannual presentation was on April 18, 2009, at locations in both Northern and Southern California.  The class continues to be offered in person twice a year and it became available 24/7 on-line in 2013.

Do not be mislead!  It is truly the ORIGINAL and the most reliable way to prepare for the IDEX California®.  Updates occur on a continual basis with changes or additions to the IDEX California®.

There is no substitute for the Original IDEX CA Prep Class©!  This is the ONLY on-line class written by a member of the IDEX California® Task Force.  The IDEX California® Task Force of professionals created the IDEX California® and have first-hand knowledge of the exam.  The in-person version brings the information to life and offers the same comprehensive review coverage as the on-line class.

The Original IDEX CA Prep Class© is inclusive of all of the content on the exam.  It is self-contained and does not require supplemental books and information.  The depth and breadth of the answers for the IDEX California® are addressed within its lesson content.  Questions and answers throughout the class are designed to reinforce the learning process.  These multiple-choice questions are presented in the format of the IDEX California® questions and are similar, but not the same, as those on the exam.  To reinforce the study process, the lesson quizzes test your comprehension of the lesson content from which the IDEX California® questions are drawn.  And as a bonus, the prep class Quiz Shuffle Review questions are randomized at the conclusion of the final lesson to retest your grasp of the critical information.

Now you can tailor your exam preparation to your learning style.  Choose between the on-line or in-person versions of this outstanding class or a combination of both.  Check out what your peers have to say on this page.

Upon completing the course and submitting the course evaluation, you shall receive a Certificate of Completion for your records.  Ten hours of credit (1 CEU) is available from CCIDC for current Certified Interior Designers.

Remember that there is no substitute for the Original IDEX CA Prep Class©!

Choose the class option that suits you best!

clcid_logoCalifornia Legislative Coalition for Interior Design (CLCID)

The California Legislative Coalition for Interior Design (CLCID) is a legislative coalition that represents the entire Interior Design Profession on issues that are important to our members and their practice.


  • Represents the interests of ALL California’s Interior Designers
  • Monitors and submits legislation and develops long-term legislative strategic plans to protect the Interior Design Profession
  • Supports the existing “Certified Interior Designer” title protection and the qualifying exams as standards for professionalism
  • Protects the public health, safety and welfare
  • Forms grass roots efforts when needed

CLCID serves as the VOICE for the Interior Design Profession

Important Links to CLCID