Well if you do the cheerleader route you'll be able to get 3 skill pts. Also some fight scene choices will increase both power and skill
Which ones if you remember? most of the fight choices i ran into were, you die, or you don't die
For example, before the mall event where your identity it's revealed, you can go to train, if you fight on the sewers against the Minyiaks, depending on your choices, you'll get 1 or 2 power and skill points, that applies to some future fights too