Again you didn't explain what you're trying to do, if you need help with implementation of a design then we need to know the design. One array per skill, what is a skill? If you have certain things that happen per level increase of a player then you could fit them in one array.
Sorry. So I want a level up system for the different skills of the player, critical chance, damage, etc. I want each skill to require certain points of experience:
Level 1 critical chance = 10% chance to crit. 100 exp points required to unlock.
Level 2 critical chance = 20% chance to crit. 300 exp points required to unlock.
And so on.