So I was pondering there for a moment trying to fit too many perk choices for what is available and I came accross a discovery. A silly one only because I haven't paid any mind to how the magic school perks work. Here is my discovery...

If i wanted to use three schools of magic I don't have to pick up all the skill level perks. Correct me if I am wrong but for example say I wanted to use restoration, illusion, and alteration. I can enchant my gear to -100% less to cast in 2 trees and only going up to master on one of those perk trees right?