<p>I am taking AP calculus AB, next year i will take Calculus BC then for my senior year I will take AP stats. I want to know if there is a good place to get Apps. Also I want to know if there is any tips for on downloading Apps or anything. Or if its crucial to back up my files and how I will do that. So if there is any tips you have just say them, because it can only help.</p>
<p>Also should i download games or can that be harmful or something?</p>