Please help urgent

i m ipcc student gave my 2nd attempt in nov 12 of group 1 but could not clear bcoz 13 mks in costing/fm & 33 mks in aggregate should i give my papers for revalution, can i pass? what is the procedure for revalution? when will the revalution results be declared & should i give gr 1 along with gr 2 in may 13 exams & my other doubts are 1. is there any changes both the groups except exclusion in certain topics in IT? 2.is service tax completely changed & is there any changes in Vat & direct tax except slab rates? 3.i hav study material as per may 2012 exam. should i buy tax module & practice manual from ICAI. n i hav T.N. Manoharan book as i used it for nov 12 exam for direct tax & vat can i continue with the same book for may 13 exam? 4.what book should i refer for service tax may 13 exam n how should I study for changes i will be doing self study. 5. pls friends giv m e some tips n approch for study to clear in may13 exams PLS HELP REALLY WORKING HARD. THANKS IN ADVANCE.