Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
Don't worry too much about the 10.0! I managed to get a 10.0 last year, without taking it too seriously until mid-January or so. That's not to say you shouldn't study at all right now, but don't forget to enjoy life while you do! :) Because you won't be able to as much in 11th.