Prepare yourself physically, emotionally, mentally, and socially.
... and when I say physically, I meant rigorous training is involved.
Expect for the worst, and hope for the best.
Parang admission test rin yan sa mga colleges, except that may physical tests din (and psycho... and medical... and test... test... test... test... well, just don't give up and you'll be fine.).
Good luck, TS.