Hello Hari,

Even if you can get around 40 % overall marks you should be able to score around 2500 rank which is a very decent rank for someone who is not sure whether he will get a seat or not.

Coming to top IITs, the cutoffs are under rank 2000 and with newer IITs the cutoff ranks under 9000, which results into cutoffof 310+ for top IITs and for newer IITs it should be around 185+.

Hope this answers you!

All the best!