Hello,

Three channels—JEE Advanced, KVPY, and SCB—are available for applicants to the 5-year BS-MS degree programme at the Indian Institute of Science Education and Research. The IISER aptitude exam must be taken by the student who wishes to apply through the SCB channel.

A candidate is only permitted to take the IISER Aptitude Test twice in their lifetime, according to the official announcement.

You can click the following link to learn more about the IISER test.

As per your query, you are not eligible because you already given your 2nd attempt.

Thank You