If you need something that doesn't take up too much time then I really think you should wait until you do have more time.
When you buy an animal it is totally dependent on you for its food, companionship and good quality of life. If you don't have much time you will not be able to provide adequately for it.
You also need to look long term. These reptiles live many years I believe. I assume you still live at home and go to school at the moment? What happens when you leave school, then home? Will you be able to find somewhere to live that allows pets? What if you decide to go overseas? Who will look after your pet? It isn't fair to expect your parents to do so (been there, done that!).