tell me Material prefferable in ipcc

which material is a good one in IPCC..., im getting confused with lot of materials used by many of my friends ..., my queries ......... wat to prefer ?..., which one is good 1 ..? which one has good subject ..? which help me to get easy idea regarding the subject ..?                                                                                                                                                                                                              plz clear my doubts ..., frnz, advisers.. or text me to 8712323793... im frm hyderabad {AP}