look here i am an aspirant for iit-jee 2009..... its only some three months since my coaching began...... u believe u have the potential than go for it....
u say dat your problem is mainly in physics..... than i recommend u one book of D.C. Pandey- Mechanics Vol.1 and Vol 2. For he has given much solved problems and tell u dat it made my kinematics sum solving basics solid..... its a good book even telling us the details of how to approach a sum.... i recommend u dat....