I just got back from passing my Microsoft 70-620 with a 914. Thought I would throw in my 2 cents worth about the exam. This was my first Microsoft exam and I thought the exam was pretty straight forward, but I wasn't impressed with the simulations. I had about 10, I dunno they just seemed cheesy to me and the OS is so watered down it's almost not even worth having them, but that's just my opinion.

Anyways, I used MSPRESS and the trial of TestOut to study. I heard the sims from TestOut were a big help, but to be honest on my particular test they didn't really help that much. I would say just stick with MSPRESS and that should be all you need with a little hands on experience. Guess I'm on to the 70-290 now!