See Candidate your marks are really good. You will definitely get TOP IISER but not in first round but in 2nd or 3 rd Round of Councilling you can get. Yes you can get a decent IISER. May be in second or third round.Here I am sharing link in which you can check all the details Of IISER Cutoffs https://engineering.careers360.com/articles/iiser-merit-list-and-cutoff

Hope you understand this very Well and All the Best.. This is from my side. Hoping that you are doing great in your Studies.

Be Cool and Calm you will get Good IISER College.May God Bless You

All the best.