Hi dear..

There are 3 possible ways for getting admission in IISER.

1. Through KVPY

2.Through JEE MAINS & Advance

3.If you are in top 1% of your respective central or state board (cut off percentage is mentioned on the iiser website) then you are eligible to give the iiser aptitude test. If you score well in the aptitude test and qualify the cutoff then you get the admission.

Since, you have mentioned that you scored 430 marks.In this case, you will have to appear for Aptitude test for getting admission, also you have to be in top 1%(only then,you should apply for IISER).

Best of luck :)

IISER have three admission channels: JEE Advanced, KVPY and SCB (State and Central Board) channel.

For the first two you have to appear in respective exams and clear them.

If you are refering to SCB channel which is based on 12th marks then you have to specify your board as they have different cutoffs for different boards. If you are from CBSE board then you are eligible and can apply in via SCB channel. As per the cutoff it will be decided whether you are eligible or not and you will have to write the entrance exam. If you qualify the entrance then further procedures are followed. Here is the link for the different board cutoffs.

https://www.iiseradmission.in/eligibility/

All the best.