>>725021585
>Can I focus on two magic schools for example to mastery?
I loaded an old end game save to check, pic rel is my character sheet, spoilered in case you don't want to know exactly how much you get to level up normally.
But tl;dr yes, you'll be able to master multiple schools fairly easily, though it might be a good idea to still focus more on one or two max, since spells still scale with your skill level even beyond just getting "master". But also leveling up one thing means it will get extremely expensive eventually, which is why maybe it's fine to do multiple schools.