P.S: If your reply is "Dont become a pilot", then pls don't reply
I like your attitude
Since, you are in your XIth I suggest you keep aviation related reading to weekends only and read your Maths and Physics for your boards well.
When you have time, you can read what ever interests you in aviation. Watch a lot of Air Crash Investigation Programs on NGC. Get yourself a MS Flight Sim.
Keep yourself fit. Thats pretty much it.