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UPSC Common Mistakes While Filling OMR Sheet and Scannable Attendance List: Check Official Guidelines

UPSC has listed common mistakes candidates should avoid while filling the OMR Sheet and Scannable Attendance List. Check the official guidelines on booklet series, roll number, subject code, answer bubbling, prohibited areas and SAL details.
authorImageRoshni Yadav30 Sept, 2026
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Union Public Service Commission (UPSC) has issued an official guide on common mistakes made while filling the OMR Sheet and Scannable Attendance List (SAL). Candidates appearing in UPSC objective-type examinations should carefully follow the instructions while entering details and marking responses.

The official document highlights mistakes related to booklet series, subject code, roll number, prohibited areas, answer bubbling, and attendance details. Candidates should check these points before submitting their OMR Sheet and SAL.

UPSC Common Mistakes in OMR Sheet and SAL PDF

Candidates can refer to the official UPSC PDF for illustrations of the correct and incorrect ways of filling the OMR Sheet and Scannable Attendance List.

Official PDF: Download UPSC Common Mistakes in OMR Sheet/SAL PDF

UPSC OMR Sheet: Common Mistakes to Avoid

The UPSC exam document highlights the following mistakes while filling the OMR Sheet:

UPSC OMR Sheet: Common Mistakes to Avoid
Area Common Mistake What Candidates Should Do
Booklet Series Encoding a different booklet series instead of the series provided to the candidate Encode the booklet series correctly as instructed
Booklet Series Not encoding the booklet series Ensure the required series is encoded
Subject Code & Roll Number Incorrect encoding of the subject code or roll number Carefully enter and encode the required details
Prohibited Areas Writing or making marks in areas where marking is not permitted Leave prohibited areas untouched
Responses/Answers Incomplete bubbling of the answer bubble Completely fill the appropriate bubble while marking a response

These are the specific categories of OMR-related mistakes illustrated in the UPSC's official document.

UPSC Online Batches 2027

1. Incorrect Booklet Series Encoding

Candidates may receive question booklets with different series. One mistake highlighted by UPSC is encoding a booklet series different from the one served to the candidate.

For example, the official illustration shows a candidate receiving Series A but encoding Series C on the OMR Sheet. Another mistake is leaving the booklet-series encoding incomplete or not doing it.

What to remember: Check the series printed on the question booklet and carefully follow the instructions for encoding it on the OMR Sheet.

Screenshot 2026-09-30 151725

2. Wrong Subject Code or Roll Number Encoding

UPSC also highlights wrong encoding of the subject code and roll number as a common mistake.

Candidates should pay close attention while entering these details and ensure that the required numbers are encoded in the designated areas of the OMR Sheet.

mistake 2

3. Marking or Writing in Prohibited Areas

Another mistake shown in the official UPSC guide is making markings or writing in prohibited areas of the OMR Sheet.

Candidates should use only the designated portions of the sheet for the information and responses requested. Unnecessary markings should be avoided.

Mistake 3

4. Incomplete Bubbling of Answers

UPSC specifically highlights incomplete bubbling while encoding responses.

When marking an answer, candidates should fill the bubble completely rather than leaving it partially shaded. The official document illustrates incomplete bubbling as an error.

Mistake 4

Common Mistakes While Filling the Scannable Attendance List (SAL)

The UPSC document also covers mistakes related to the Scannable Attendance List (SAL). The key issues highlighted are related to the placement of candidate details.

1. Filling Details at the Wrong Place

Candidates may enter their details at a place other than the designated location on the SAL.

The official guidance illustrates the correct location for entering candidate details and contrasts it with an incorrect placement. Candidates should therefore carefully identify the prescribed area before making an entry.

2. Filling Details at Multiple Places

Another mistake highlighted by UPSC is entering candidate details at multiple places.

Candidates should enter the required information only at the designated location on the Scannable Attendance List and avoid making additional entries elsewhere.

UPSC OMR Sheet and SAL: Quick Checklist

Before completing the OMR Sheet and Scannable Attendance List, candidates should check:

  • Correct booklet series has been encoded.

  • Booklet series has not been left unencoded.

  • Subject code is correctly encoded.

  • Roll number is correctly encoded.

  • No writing or markings have been made in prohibited areas.

  • Answer bubbles are completely filled.

  • Details on the SAL are entered at the designated place.

  • The same details are not entered at multiple places.

These points are based on the mistakes specifically illustrated in the UPSC's official guidance.

 

UPSC Common Mistakes While Filling OMR Sheet FAQs

What are the common mistakes in the UPSC OMR Sheet?

UPSC highlights incorrect or missing booklet-series encoding, wrong subject code or roll number encoding, markings in prohibited areas and incomplete bubbling of responses.

What mistakes should candidates avoid in the UPSC Scannable Attendance List?

Candidates should avoid entering their details at the wrong location or entering the same details at multiple places.

What is incomplete bubbling in the UPSC OMR Sheet?

Incomplete bubbling means the answer bubble has not been filled completely while encoding a response. UPSC specifically illustrates this as a common mistake.

Where can I check the official UPSC OMR and SAL guidelines?

The official UPSC PDF titled “Common Mistakes Done While Filling OMR Sheet/Scannable Attendance List” is available on the UPSC website.
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