I am stuck with a script. I want to prohibit to a might hero to gain any expert magic school. There are two ways but both are driving me crazy:

1)Magic is offered until advanced. How to avoid being offered expert afterwards?
2) Magic is offered until expert but when the hero launch a mass spell, it goes advanced. Still I have the problem of the mouse pointer: when a mass spell is launched the pointer is not on a unit. When an advanced is launched a unit must be selected.

Any ideas?