Hi,
It sounds like you have been doing a lot to prepare, and you've been doing pretty much what I would have suggested anyway, namely, working on foundations of math.
The good news is that our course really does take you through everything you need to know (as long as you have that basic knowledge of math down already) so it sounds like you're well prepared. If I were you, I wouldn't worry too much about strategies for PS and DS questions, as these will be covered in class (in fact, session 1 tackles DS right off the bat!)
The only thing I would suggest instead would be to go ahead and take the foundations of math workshops, which are free with the course. If you're sure you want to take one of our classes, then sign up for the one you want, and after doing so you can sign up for the workshops for free. If you're still unsure of what class you want to take, then sign up for the workshops, and the price will be deducted from the cost of your course when you do sign up. You can see upcoming workshops here:
http://www.manhattangmat.com/gmat-prepa ... ne-day.cfm If none of them fit your schedule, as soon as you sign up for your 9-session course you'll have access to recordings of these workshops in your student center.
Hope that helps, but don't hesitate to contact us with further questions!
Best,
Caitlin Clay
Student Services Associate