Whether change in idt book is required???

I m a CA Final Student... i Have Read IDT from Bangar published for May 2011 exams... i just want 2 know shud i continue wid dis for nov 2011 exams or may i need 2 refer nov edition of bangar... as i saw there r lot of changes in CENVAT Credit Rules, 2004... Can Any1 Provide me d notes of chapters Central Excise Rules & CENVAT Credit Rules, 2004 of IDT Bangar Nov Edition...