Written and reviewed by oral and maxillofacial surgery residents and crosschecked with national guidelines and best practices.
Free practice from OMS Collective
- 10 free renal questions in the real exam screen. Start the demo. It uses the same screen as our paid exams, with lab values, a calculator, flags, strike-outs and highlights, so you can see how the exam feels before you buy anything.
- A 20-question CBSE sample PDF. Printable, so you can work through it on paper. You can get it, plus every free guide, on the free study guides page.
- Free study guides. Eleven PDFs written by OMS residents: organ-system guides for renal, cardio, respiratory, pharmacology, microbiology and immunology, a physiology arrows sheet, three study schedules and the question sample. Get them all in one download.
Official free material from NBME
NBME publishes sample items for the Comprehensive Basic Science exam that you can read for free. It also sells a paid self-assessment, which is a separate product. Our questions are original, and we never copy or reword NBME items.
How to use free questions well
- Time yourself. Do the demo in one sitting. Pacing is a skill that you can only practice with a clock.
- Read every explanation, including the ones for questions you got right. Learn why each wrong choice is wrong.
- Write down the topic of each miss. After a few sessions you will see a pattern, and that tells you where to spend the next week.
- Retest later. Come back to a weak topic after a few days. It tells you whether it actually stuck.
When free is not enough
A short demo can't show you stamina or a full score report by system. When you want that, our paid exams are 200 questions in four timed 50-question blocks. The CBSE Practice Exam 2026 and the CBSE Practice Exam 2027 are $25 each, and the bundle is $40. If you want one system, the organ-system mastery exams go deep on renal, cardio, respiratory and immunology.
Wondering when to take the real exam? See CBSE 2027 dates and registration.
Frequently asked questions
Are there free CBSE practice questions?
Yes. OMS Collective offers a free 10-question renal demo in the real exam screen and a free 20-question CBSE sample PDF. NBME also publishes free sample items for the Comprehensive Basic Science exam.
What is in the free OMS Collective study guides?
Eleven PDFs: organ-system guides for renal, cardio, respiratory, pharmacology, microbiology and immunology, a physiology arrows sheet, three CBSE study schedules and a 20-question sample.
Are the OMS Collective questions copied from the real exam?
No. Every question is written for OMS Collective. None are recalled exam items and none come from other question banks.
OMS Collective is an independent study resource. It is not affiliated with or endorsed by NBME, AAOMS or the ADA. CBSE and NBME are trademarks of the National Board of Medical Examiners. Nothing here predicts or guarantees a score.