Hello Aspirant

Here are the names of the best top colleges which accept the JEE MAIN;

1. Birla Institute of Technology, Mesra. 

2. Delhi Technological University, Delhi. 

3. Indian Institute of Engineering Science and Technology Shibpur. 

4. Indian Institute of Space Science and Technology, Thiruvananthapuram. 

5. Institute of Chemical Technology, Mumbai. 

6. International Institute of Information Technology Bangalore.

91 percent is indeed a good score but to ensure admissions in any of the top or above mentioned institutes, one has to look at the cut offs.

The lists for cut offs are not out yet.

Nonetheless, you can calculate your rank by simple calculation.

Suppose 874469 are the number of candidates appeared for the January exam.
So rank formula is (100- your total score) * 874469 / 100.

Best of luck!