Hello Ashwin,

Here is a list of some of the best institutes for SSB training in India:

1. Baalnoi academy
2. The Cavalier
3. Olive greens
4. Minevara
5. Doon defence academy
6. No frills academy
7. Colonel's Persona Primers
8. Siegwald Academy - Only in Eastern Region
9. VJ’s Indian Defence Academy

it can't claimed which is the best among these but all of these are found to best in India.

GOOD LUCK!