Most of my preparation came from work as a physics tutor during the year and a half or so before taking the exam. I didn't really have any special preparation. I took a practice test about a month before the exam, and scored about 950 or so. Over the next month, I simply worked through the other practice tests and found which types of problems gave me trouble and were unfamiliar to me, and reviewed those topics.
I would guess that you probably know how to do the vast majority of the problems on the exam, and given enough time, could get at least 85/100 right. So probably the best thing to do to improve your score is to practice doing simple physics problems really fast. Go to your introductory textbooks and randomly choose problems to solve and focus on working quickly and efficiently, and doing things like letting pi=3 and g=10. Also, I would recommend looking through the practice tests and finding problems that seem difficult, and looking for indirect ways of finding the answer, such as dimensional analysis and order of magnitude estimates. I found that many of the problems that I didn't really know now to solve could be answered just by thinking about what sort of answer seems logical, and eliminating options.
Don't spend more than 4 minutes on a single problem. When I took the actual exam, I skipped a few of them with the intent of going back. I was able to get through and return to a couple of the ones I skipped.
As far as what to read for things like laboratory methods, I didn't really have much to read from, but I did review a few of the supplemental packets that went with my lab courses, and they explained things like error analysis and stuff like that.
Sorry I can't be of more help. There is a Schaum's outline that I didn't use, but I heard it was a pretty good outline to review.