Hiya
Well, the first thing which I would say is that it is too early to prepare for 2010 exams.
If you really want to prepare, then you can start with basic English.. read novels, newspapers, magazines. Improve your general awareness about as many things as you can. You can become an active participant of the Lounge section of this forum and then gradually move on to CAT related threads. This should be enough for starting MBA prep.
Here is the link to the Lounge section:
The Lounge
Take part in various discussions and have fun!