in reality intelligence and wisdom are biproducts of experience. they don't count into the experience itself
naturally, as you progress in power, magic, and battle experience you and your character's intelligence will increase
you shouldn't need a meter to confirm this for you
Well technically you should see intelligence as simple mental potential. The more intelligent someone is, the faster they learn/understand, and the more they can learn/understand too.
So technically, this is pretty much fixed at birth, and maybe switched SLIGHTLY with the use of certain substances (which usually have to be taken daily), or by simple moving more and increasing oxygen flow in your brain.
Wisdom on the other hand, is learned through experience, and tips. experience makes it really effecient, and tips' efficiency depends on how prone you are to listening to other people