Myself being a repeater, the answer may be summarized as under:
After 5 days of testing you are a different person- who knows his weaknesses, strengths, potential, resource management, crisis management, organising abilities. This self introspection makes an individual to conquer any obstacle in life. We start to live like a leader. The lifestyle of the forces will inspire you the most. Even if you can't make it into but you surely will acquire those traits in your personality.
This process requires a certain kind of personality. You need to improve your communication skills, enhance your awareness.
It might seem easy to be an officer in armed forces but the career here is more challenging than you have ever thought of. More adventurous then your most adventurous activity in life.