i found out how to get more skill points from very early possible:
after the very first tutorial battle, you will get 1 skill point, save your game, then scan the game for value 1 with value type 4 byte, use 1 skill point, after its become 0, next scan 0, reload save, go to skill points again, next scan 1, use skill point, next scan 0 again, repeat until you get your address