Hello Priyanshu, 

Read all the data and processes that are followed in SSB examination clearly which is the most basic step. Read a lot of GK, currently heated topics for Group discussions, and the knowledge of your subject.

The board checks your intelligence as well as your attitude, public skills, it questions your integrity, your team work, your listening skills, humility, etc.

Watch videos on YouTube and different good sites that give tutorials for SSB preparation. 

I hope it is helpful.

Good luck!!!