Mistake 1: Bubbling at the Last Minute
Most common and most dangerous. Bubble every 10-15 questions.
Mistake 2: Wrong Question-Answer Alignment
Always check Q.No before bubbling. A single shift cascades to 50+ answers.
Mistake 3: Incomplete Erasure When Changing
Fully erase old bubble. Half-erased marks count as no response.
Mistake 4: Skipping an OMR Row
After every 25 questions, pause and verify the row number matches your question number.
Revision history
- 19 September 2026 — Initial publication
Frequently asked questions
What is the most common OMR mistake?
The most common mistake is leaving OMR bubbling until the end. Candidates run out of time and leave questions blank despite knowing the answers. Bubble every 10-15 questions.
Can I change my OMR answer?
Yes — use a soft eraser to fully erase and then fill the new circle completely. A half-erased mark may be read as two answers (both wrong).
What if I skip a question number by mistake?
This is catastrophic — every subsequent answer shifts by one. Stay alert, and during the review pass, verify question numbers match before bubbling.
Related reading
Hand this plan to your study group.
CrackCMS is a free study desk for medical PG aspirants — 3,300+ PYQs, full mock simulators, spaced-repetition flashcards and an AI tutor that compares stem formats across UPSC CMS and NEET PG.
CrackCMS by CrackLabs AI · Editorial policy · Medical review policy
Join the discussion
Comments are opening soon.
The CrackCMS blog uses GitHub Discussions for comments (no spam, no third-party trackers). The discussion forum is being set up and comments will appear here automatically once it's live.
In the meantime, ping us at [email protected] or use the in-app AI tutor for any clarification.