Hello,
To be eligible to get seat in Indian Institute of Science Education and Research, Thiruvananthapuram you must fulfill the eligibility criteria. And the eligibility criteria is that a candidate must have passed 10+2 with Science stream in the year 2019 or 2020.As you have passed in the year 2018 you are not eligible to apply for it.
You can refer the article below for other detailed information
IISER Admission 2020

IISER Mohali

Admissions Courses & Fees Placements Reviews

Shortlist

Brochure