I would recommend buying an old copy (something around $5 on half/amazon) of university physics by young and freedman and work through the problems in all sections.
I would do the same with an old copy of modern physics by serway, moses, and moyer.
Just do problems out of the books randomly so you get a constant variety of topics. Maybe you could program something simple (in whatever language you can code) that selects random problems for you so you get a very good random jumble like you'll see on the exam ... it should take about 30 min max to write since you'll have to program in the chapter #s and how many problems in each section/whatever. You could even cross them off in the book (why not, the books were super cheap) after you finish them.
These two texts combined together will cover like 95% of what is on the Physics GRE. The content of the books isn't too difficult, and most of the problems are able to be solved in a few minutes, which is the same difficulty level and pace you'll have to keep up during the exam ... but with multiple choice.
as for the normal GRE, umm you really shouldn't have to prep for the quantitative section. i really doubt any hard science major is going to get anything less than the top 10% of test takers. I doubt any program will really care how you did on the verbal and writing, so studying for that stuff might be a waste of your time, that's my opinion at least. Maybe buy a cheap ($10-15) book that has a few practice tests if you REALLY want, just so you're not surprised by the layout and whatever.
The revised verbal section isn't easy to quickly increase your score like it used to be. before the change, you could memorize a list of 250 GRE words and increase your score by 100 points (out of a 600 range), but now memorizing those same words might get you a 2 point increase (out of a range of 70 now i think). Anyway, I wouldn't bother studying for the general GRE unless English isn't your primary language.