Hello Kiran,

According to the previous data,you have more changes of getting best college in NITs,If you got 99.51 percentile in JEE mains 2020,then you rank can be calculated by using the formula given below.,

100 - your total percentile score is the percentage  of people ahead of you. 869010 are the number of candidates appeared for Jan exam. So rank formula is (100 - your total score) X 869010 /100.

So your expected rank would be nearly 4258.

And also rank will be changed after the April exam due to number of students who attempt the April exam will be changed.The final rank will be given after the April exam.

You can also check your colleges that you are eligible by using the college predictor which link has been given below.,

Hope this helps you...