My simple advice is – develop the right attitude and motivation. You need to have a high
sense of personal responsibility which you need to be showing at your home, school/college,
or at the workplace.
Helping parents and siblings, doing projects and experiments, participating in debates,
exhibitions, and technical festivals, organising events with friends, developing one or two useful
hobbies, playing sports, and participating in camps and adventure activities will certainly help
you to develop the desired qualities.
You must also read books and newspapers, gain knowledge of current and military affairs,
and develop good English speaking and writing skills to face the SSB with confidence.