Tip for making Gale(or any wizard) learn scrolls. If you open up his spell book, then is a small button that opens a new menu(I think it is an open book with a flame, it is early in the morning for me), and it lists all the scrolls you can learn that you have, tick all the boxes, and then the pay the money. Took me 1 minute to spend over 3000 gold learning spells.