Hi aspirant

The eligibility criteria of IISER is :Those who have passed 10+2 in 2018 or will pass in 2019 are only eligible through three channels:

1.JEE Advance

2.KVPY

3.SCB: IAT aptitude test.

You are not eligible for any of these.

Visit the official website to check the eligibility: https://www.iiseradmission.in/eligibility/

Hope this was helpful.