Hello aspirant!!

Every top IIT has certain cut offs which vary every year and then only the students are selected. Seeing to your marks I believe it to be somewhat difficult to get into top IIT's. GATE 2021 Cutoff for IIT Madras for CS was 816 while for IIT Kharagpur it was 776 for the General Category. If we see the GATE cutoffs for 2021 and 2020; the cutoffs for most of the subjects were decreased from the previous year. For example, GATE cutoff for CSE was 28.5 in 2020 while it decreased to 26.1 in 2021. To get into top IIT's, the cutoff ranks are very higher.

Further, you can read the GATE cutoff article by following the below mentioned link :

https://engineering.careers360.com/articles/gate-cutoff

Hope this information prove to be helpful.

Good luck!!