I have to tell you that if your mom tells you to leave it alone, then you'll have to respect her wishes. You can read as much as you can, but you can't do any practical witchcraft until you are much older and are independent. It won't go anywhere, so don't feel you are wasting time. Meanwhile, you can strengthen your wisdom by doing as much voluntary work that you can. Animal shelters and old folks' homes are a good place to begin. Failing that, you can ask around your neighborhood if anyone needs a helping hand.