No it is necessary, the subject section is 4 .
Mathematics, physics, chemistry, biology.
Exam duration is 3 hours
Total number of questions is 60

Physics- 15 Questions

Chemistry -15 Questions

Mathematics -15 Questions

Biology- 15 Questions

And total marks is 180 marks

The points of marks is

3 marks for each correct answer.

a deduction of 1 mark for each incorrect answer

You can visit here for see important dates exam pattern , syllabus also from this link

https://engineering.careers360.com/articles/iiser-admission

Thank you. I hope this answer helps you.

Indian Institutes of Science Education and Research Apt ...

Eligibility | Application | Exam Pattern | Admit Card | Result | Answer Key | Counselling | Accepting Colleges

Get Updates Brochure