Hi Aspirant 

There are exams which are conducted every year so that brilliant student can get help from the government in the form of scholarship.Like NTSE,KVPY,RMO etc.These exams are quiet tough but once you are selected you will get scholarship till you are studying even upto pg.Here you can know much more about these entrances by visiting the link given below:

https://school.careers360.com/exams

If you are in 12th KVPY  and Olympiads would be suitable for you.

All the best.