How to study direct tax give me a technique

Hi ...am preparing for NOVEMBER 2011 ATTEMPT COULD ANYONE TELL ME WHERE FROM WHICH BOOK SHD I STUDY DIRECT TAX 

HOW MUCH TIME SHOULD BE DEVOTED TO NUMERCIALS IN DT 

HOW MUCH REVISION IS NEEDED......PLZZZZ HELP ME AS SOON AS POSSIBLE

 AND FOR    IDT AND DT FROM WHERE TO DOWNLOAD CASE LAWS PLZZ HELPP

kasie DIRECT sub ko plan karna hai including rivision