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You fill in your roll number, glance back at the admit card, and one digit is wrong. Or the booklet code on your OMR says B while the booklet in your hand says C. What matters is who knows about the mistake, and when.
What should you do if you wrote the wrong roll number during the exam?
Stop and get it on record. Exact procedures differ between exams, so treat these as general steps and let the invigilator's instruction decide.
Put your pen down. Do not touch the wrong entry.
Raise your hand and wait for the invigilator to come to you.
Show them the mistake and your admit card side by side.
Follow their instruction exactly; they know the procedure for this exam.
Ask them to note it, then go back to the paper.
A short script helps:"Sir/Ma'am, I've made a mistake in my roll number on the answer sheet. It should be [number], as on my admit card. I haven't changed anything. What should I do?"
In NEET (UG) 2026, the test booklet was handed out at 1:45 PM, candidates wrote their particulars on it at 1:50 PM and the test began at 2:00 PM, according to NTA's NEET (UG) 2026 information bulletin. Those last 10 minutes before the start are when you fill in these details, and the best time to catch a slip.
Why shouldn't you just correct it yourself?
Because a quiet fix can look like tampering. NTA's NEET (UG) 2026 bulletin lists "providing incorrect information and/or overwriting of the Roll No./ Test Booklet No./ own Name of the Candidate" on the OMR sheet as an unfair-means practice. The same list includes erasing or obliterating any information printed on the OMR sheet. The bulletin says a candidate booked for unfair means can be debarred from NTA exams for up to 3 years, depending on the gravity of the case.
Board exams have similar rules. CBSE's unfair-means guidelines, sent to schools with a January 2025 CBSE circular, include "erasing or obliterating any information printed on the Answer Book(s)" and "providing wrong information on the answer sheet". Both sit in a category whose listed penalty is cancellation of that year's exam in all subjects.
NTA defines unfair means as activity that gives a candidate an unfair advantage. But someone looking at an overwritten digit later cannot see your intent; an invigilator's note made at the time can record it. So tell them rather than fixing it with whitener or an extra stroke.
What if you notice the mistake after the exam?
Act the same day, while the details are fresh.
Write down what happened: exam, date, centre, room, the wrong entry and the right one.
If you are still at the centre, tell the invigilator or centre superintendent before you leave.
Keep your admit card and any candidate copy of the answer sheet safe.
For NEET (UG), NTA puts scanned images of the OMR sheets on its website after the exam, and candidates can challenge the OMR grading for a non-refundable fee of ₹200 per question, according to the 2026 bulletin. The same bulletin says there is no re-checking or re-evaluation of answer sheets.
To raise a problem, the 2026 bulletin directs candidates to the NTA helpdesk (011-40759000 or 011-69227700) or the exam's official email, and says an email must include your name, application or roll number, postal address and contact number. Contacts change each year, so check the current bulletin on the official NEET website.
For board exams, your school is your link to the board. Tell your class teacher or principal in writing so they can raise it through the official channel.
What should parents do?
Stay calm and practical; your child probably feels worse than you do. Help them write the note, find the right official contact and send one clear message rather than several anxious ones.
If the worry is affecting sleep, food or the next paper, talk to a school counsellor or call Tele MANAS, the government's 24/7 tele-mental health service, on the toll-free number 14416 (Ministry of Health and Family Welfare via PIB).
How do you stop it happening again?
Practise the filling-in, not just the questions. In every mock test, copy the roll number and booklet code from a sample admit card, then check them before you start. See also our guides to checking your admit card details, correcting a mistake in your answer sheet and handling exam-day emergencies.
If you have papers left and the slip has thrown your revision off, Fermi's AI tutor can work out what you already know and build a plan for the session, so you sit down to a clear next step.
