Hello Geethika,
I would like to mention the eligibility criteria for IISER below taken from the official website:
Candidates who have passed 10+2 or equivalent level exam with science stream in 2018 or 2019 are eligible to apply for admissions. Candidates will be admitted to IISER only through following three channels.
These channels will be referred to as KVPY, JEE, and SCB, respectively.
Indian nationals and students belonging to PIO or OCI category are eligible to apply provided they satisfy the eligibility criteria described below.
KVPY Channel
JEE-Advanced Channel
SCB Channel
For more info, please visit the website below.
The link is: https://www.iiseradmission.in/eligibility/
Hope this helps!
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile