Here is a chapter where your characters can start studying. In this chapter, everyone who chooses to study starts up individual chain and I will ask few questions. You then try to give me answers and if you get them right, congradulations, you earn bonus points for next exam.

Of course if studying is too lame for you, (and it is), you can decide to do one of following two instead:

1) go to gym and work on your body
+ physical strength

Or

2) go to UA disaster site and learn some first aid
+ survival

Leveling up chances:
Lvl 2 - 90%
Lvl 3 - 80%
Lvl 4 - 70%
Lvl 5 - 60%
Lvl 6 - 50%
Lvl 7 - 40%
Lvl 8 - 30%
Lvl 9 - 20%
Lvl 10 - 10%