You can apply for IISER Aptitude Test even if you didn't have Biology in 10+2. Students from PCM group can apply for IISER ( Indian institute of science education and research) aptitude test.
http://engineering.careers360.com/exams/iiser-aptitude-test

Hello,


No, not necessarily. Eligibility Criteria requires a Candidates to have passed 10+2 or equivalent level exam with science stream in 2019 or 2020. Candidates are admitted to IISER only through following three channels :

• Kishore Vaigyanik Protsahan Yojana (KVPY) channel
• Joint Entrance Examination (JEE-Advanced) of the Indian Institutes of Technology
• State and Central Boards Channel (SCB)

I hope this helps.

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