Hello aspirant,

It is difficult to give exact number for which you can get admission admission into IITs. As cut-offs varies from IIT to IIT based on many factors like number of seats available, difficulty level of the exam, caste category, number of students appeared in the exam, etc. It is difficult to predict the cut-offs, as they vary from year to year.

For previous year's official cut-offs of JOSSA.

https://josaa.nic.in/Counseling/seatallotmentresult/currentorcr.aspx

You can predict Colleges you can get for your JEE Advanced rank, using below mentioned link.

https://engineering.careers360.com/jee-advanced-college-predictor?utm_source=qna&utm_medium=jee_adv_cp

May this information was helpful to you.

Best of Luck!!