Sims 3 Witch , How to make her learn faster ?

The pink bar below your witches portrait shows how much magic you have left. Once it's empty, you need to wait for it to recharge. There are 10 levels for spells so you need to level up the skill to earn more spells. I think it's a hidden skill but the game will tell you each time you level and what spells you've learned. More details can be found below...

http://simsvip.com/game-guides/sims-3-supernatural/
http://www.carls-sims-3-guide.com/supernatural/witches.php