Hello Aspirant,

See your eligibility for JEE-Advance is not determined by your marks in JEE-Main instead it is determined by the percentile you scored in your JEE-Main final result. As we know that NTA released the cut-offs for different categories so it is also described below :-

• Common Rank List (CRL) - 90 .3765335
• GEN-EWS - 70 .2435518
• Other Backward Classes (OBC-NCL) - 72.8887969
• Scheduled Caste (SC) - 50.1760245
• Scheduled Tribe (ST) - 39.0696101
• PwD - 0.0618524

So in your case you have to secure 72.8887969 percentile to become eligible for JEE-Advance. For more details kindly refer to the link given below :-

https://engineering.careers360.com/articles/jee-main-cutoff/amp

If you are seeking admission in IIST Trivendarum then let me clear you that IIST Trivendarum accepts admission in BE/B.Tech/Dual degree courses only through JEE-Advance. For complete admission process refer to the link given below :-

https://www.careers360.com/university/indian-institute-of-space-science-and-technology-thiruvananthapuram/admission

You can use JEE-Main College Predictor to predict your chances of admission in different engineering colleges of India :-

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

I hope this information helps you.

Good Luck!!