Need your help-I am a student of science background

I am student from science background studiying 12th standard now. I have decided to do CA after my 11th standard. Hence i started to get coaching of 11th and 12th standard accountancy,economics and mercantile law privately and finished it within a short term of 6 months. I am perfect with mathematics. How ever i had much time( i will have eligibiliy for cpt in june 2010). could you suggest any tips for cpt subjects?

also i need details of some books for refering all the 3 subjects( i had icai study material)

Is the online test better than paper,pencil mode test?