Hi Kunal,

IITs i.e. Indian Institute of Technology are the colleges in which we can take admission by clearing the JEE Advance examination and for this exam  you will be eligible if you have successfully crossed the cut-off of JEE Mains examination. But with a JEE Mains rank of 900 you can go for different NITs i.e. National Institute of Technology. Your rank is good just prepare for JEE Advance examination nicely and grab the seat of IITs.

I hope that i have answered your question successfully.