Which college should I opt, my score in JEE Mains is 99?

Harjeevan !Since you haven't scored well in JEE mains so you will not get admission in top Government institutes but dont worry there are some private institutions that are doing equally good as them,you may get admission in them by scoring a good rank in their entrance examination and thereafter ge

If you belong to any of the reserved categories, you will get an NIT during counselling. If you are a general category student, you may not get an NIT. But you could get some good private colleges.