Ok Big Baller, by this time i'm sure you know where is your strength and where is your weaknesses. Med three is probably the hardest semester in basic sciences (hence if you survive it, you done with basic sciences... lol). A good approach to tackle Med 3 is to realize that Micro/Immuno is more high yield than Neuro. But in reality, you will spend 85% of you time studying for Neuro (because Dr. S like it that way).
Split you time wisely between Micro and Neuro, but make sure you really learn micro very well (it will hunt you down if you don't). Make sure you do lots of questions (kaplan, exammaster, etc) because that will help you understand the reasoning behind micro questions.
As for Med Psych, try to get you one of those Kaplan video because it breaks it down and makes it easy. That class is not hard to pass, so don't overkill yourself on it.
Hope this helps