No as per the IISER eligibility criteria, you need to give IISER aptitude test with all the four subjects that is Physics, Chemistry, Mathematics and Biology. There will be 15 questions from each sections. 3 positive marks for each correct answer and negative marking of -1 for each wrong answer so you can try to choose wisely if you are a PCM student.

Refer to the link below for more detailed information about the same...

https://engineering.careers360.com/exams/iiser-aptitude-test

Best wishes. Thank you.

Hello,

The eligibility criteria required for iiser aptitude test is that a candidates should have passed 10+2 or equivalent level exam with science stream in 2019 or 2020.Candidates will be admitted to IISER only through following three channels. These channels will be referred to as KVPY, JEE, and SCB, respectively.
You have to attempt Mathematics and Biology both sections, whether you are PCB or PCM student.

i hope this helps.

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