296 exam is not very difficult. Take your time and read the questions and answers carefully. I had already MCSA certification and for upgrade to MCSE needs 70-293 and 70-294 and a design exam (70-297 or 70-298).
Microsoft trainning kit is best for all microsoft exam. Beside this i used ucertify exam simulation to supplement my hands. The questions are as tricky, please pay attention to answers as two choices may only have one word different. A lot of the questions are playing the same word game. Read the answers carefully.