IES Prelims Answer Key 2027 Out (Soon); Check Paper 1 and Paper 2 Solutions

IES Prelims Answer Key 2027 will be released after the successful completion of the UPSC ESE Prelims Exam, scheduled for January 31, 2027. Once released, the answer key will help candidates evaluate their performance, calculate their probable scores, and assess their chances of qualifying for the next stage of the selection process, the Mains exam. Candidates will be able to check UPSC IES Prelims Answer Key 2027 for their respective subjects to compare their responses and estimate their performance in the exam.

How to Calculate UPSC IES Prelims Marks?

Once you have the answer key, calculating your probable score becomes easy. Here's how to do it:

Marking Scheme:

• Correct Answer: +2 marks
• Incorrect Answer: –0.66 marks (1/3rd negative marking)
• Unattempted Question: 0 marks

Steps to Calculate Marks:

1. Count the number of correct answers and multiply by 2.
2. Count the number of incorrect answers and multiply by 0.66.
3. Subtract the total negative marks from the total positive marks.

Total Marks = (Correct × 2) − (Incorrect × 0.66)

Example Calculation:

Let’s say you attempted 80 questions correctly and 10 incorrectly in Paper 1:

(80 × 2) − (10 × 0.66) = 160 − 6.6 = 153.4 marks

Repeat this process for Paper 2 and then sum both scores to get your final Prelims score out of 500.