Validates knowledge of the DMAIC method, lean tools and the statistics needed to lead Six Sigma process-improvement projects.
CSSGB is a 110-question, open-book multiple-choice exam (100 scored) in 4 hours 18 minutes. Many questions test whether you can find and apply the right tool or formula from your bound references. We compared the main options on question style, official coverage and price.
Most people should start with Quality Gurus' free 50 questions. Use ASQ's three-exam question bank as your main check, and add the ASQ Study Guide or a cheaper bank for extra reps.
| Practice test | Best for | Questions | Price |
|---|---|---|---|
 CSSGB Free Practice Tests | Free first look | 50 | Free |
 ASQ CSSGB Question Bank | Official question bank | 300 | $119 |
| ASQ Certified Six Sigma Green Belt Study Guide, 2nd Edition | Printed section drills | 500+ | $60 |
| CSSGB Practice Test Package | Budget mock exams | 522 | $25/3 months |
 QCI CSSGB Online Practice Exam | Large question pool | 1,000 | $70/year |
 Pocket Prep ASQ CSSGB | Study on your phone | 1,000 | $21/month |
Two free sets of 25 questions: a review set that explains each answer as you go and a timed mock of 60 minutes. Both run in the browser.
Great fit if you want to see exam-style CSSGB questions and find your weak sections before paying for anything.
Poor fit if you need exam-length runs; use the ASQ Question Bank.
Three 100-question sets from ASQ with a timed exam mode and a review mode that explains right and wrong answers. ASQ says some questions were drafted with AI and all were reviewed by Black Belt holders.
Great fit if you want ASQ-written, exam-length sets with results by section.
Poor fit if you want printed questions you can mark up (see the ASQ Study Guide) or cheaper volume (see Quality Gurus).
A softcover with 400+ questions grouped by Body of Knowledge section, solutions that cite the BoK, and a 100-question practice exam in random order.
Great fit if you want to practise by section and learn where answers sit in your handbook.
Poor fit if you want a timed on-screen run; use the ASQ Question Bank.
Ten tests with explanations: a 100-question mock drawn fresh from a 318-question pool on every attempt, seven topic quizzes and the two free sets.
Great fit if you want cheap volume and a new full-length mock each time you sit one.
Poor fit if you want ASQ's own wording; use the ASQ Question Bank.
A 1,000-question bank with explanations and references, taken by category or as a simulated exam. It installs on one Windows or Mac computer and does not run on phones or Chromebooks.
Great fit if you already study from QCI's Primer and want a large bank to match.
Poor fit if you study on a phone or tablet; use Pocket Prep.
Short quizzes by section plus missed-question, weakest-subject and timed quizzes, each with an explanation. Built for short sessions rather than a full-length sitting.
Great fit if you want daily practice in short sessions between work.
Poor fit if you want full-length timed exams; use the ASQ Question Bank.
ASQ: Green Belt exam page ↗Reddit: passed CSSGB, resources reviewed ↗Reddit: green belt study experience ↗Reddit: handbook, QCI primer, study guide ↗Reddit: question bank follow-up ↗
ASQ does not publish a free sample exam; its question bank and study guide are paid. Quality Gurus gives 50 free exam-style questions (a 25-question review set and a 25-question, 60-minute mock) with explanations and no signup.
Candidates describe ASQ's question bank as harder than the real exam, with explanations that are long and calculation-heavy. Study-guide questions are simpler, but the real exam rewords the answer options more than the book does.
Two or three full 100-question runs on questions you have not seen, each followed by a full review, is a sensible target. ASQ's bank has three sets and Quality Gurus draws a fresh mock each attempt.
Yes. The exam is open book, but references and notes must be bound (stitched, glued, ring or spiral binders) and stay bound. Build and tab your reference before you start timed practice.