Of the three sections, I am most concerned about PS.
I am looking for a course that can give me solid content review but also access to lots of practice materials -- I already have both the Kaplan and EK books, but I think the routine and discipline of going to class, say, 2x week and also being drilled with practice materials will be most helpful for me.
I can't speak for the EK classroom, but the Kaplan classroom, in my experience, is worthless. You are just read the coursebook by someone who knows just a little more than you do. It's definitely not high yield learning time. I would be willing to wager that you will either know the material and be bored or not know it and be frustrated. Either way, it wasn't the best choice, at least for me.
If you do need structure you might be better off with a study buddy and some other books. If you did Kaplan 2x you had access to all of the classroom materials, so take a look at them for yourself and see if you think it's worth it.
I, like yourself, have really been struggling with the PS section. I think half was intimidation and the other was just simply a lack of preperation from my physics courses, which were years ago.
I tried:
Kaplan: didn't really like it for PS. They would assume you knew more than you might know and didn't really reinforce the info well.
EK: way to little background info. I felt that if they would just explain this little thing or that or why they are doing what they were doing I would have understood it 10x better, but needless to say they didn't.
Nova: This wasn't bad, but it seemed to go from very basic to very difficult in about the span of 1/2 a page (plus some of their problems required a calculator... WTF?). So, I got the basic stuff, but missed the transition the more difficult. Nice chapter review questions though.
Now I'm doing the Berkeley Review and let me tell you, it is a night and day difference. These guys teach you what you need. They don't make the assumption that you already know it, they walk you through the material step-by-step. I am starting to think I might actually have a shot at increasing my PS scores. I haven't tried their Gchem yet, but I've heard it's equally as good.
I know they don't have a course on the east coast, but their books are golden. At least thus far.
I would honestly recommend picking up the BR PS books and setting up a study schedule, then just make yourself stick to it.