Study groups are great! I'm glad you two have hooked up.
anjang, re: your mention of practice materials, two things:
(1) You are going to need to go back over some of your old materials, even old practice problems, because there were some "holes" in what you learned the first time through - so realize that, just because you've already done something doesn't mean you're actually done with it for good. :)
(2) You can get new OG questions by purchasing OG13 (200+ new quant and verbal Qs). If you download the new GMATPrep (2.0), you'll also get 15 free practice questions for each of the question types, and you can buy access to about 400 more (combined) Q and V questions through the GMATPrep 2.0 software. These are all new questions that haven't been released before.
On the test day, number 2 and number 3 I simply could not figure out, and i think i panicked. I should have spent more time on it and it didn't go well- timing was off.
I doubt that the problem was that you didn't spend enough time. More time does not automatically equal a correct answer - sometimes the question is just too hard. (In fact, as a general trend, the more time we spend above, say, 3m or so, the *less* likely we are to get something right - because spending all that time is an indication that we're struggling with something on the problem...)
We don't know for sure exactly which problems count, but we do know that we all get the same mix of "counted" problems (from different topic areas) - the variation is in the experimental questions. So if you get more combinatorics / probability than usual, that's because some of them are experimental questions, in which case you don't care. Remind yourself of that if that happens again. :)
Note that accuracy for certain question types can change from test to test simply depending upon the difficulty mix that you happen to get. If one test happens to have a harder mix of SC and the next one happens to have a harder mix of CR, well, then your performance is going to change accordingly.
At the same time, 11 wrong in SC indicates that there's definitely some work to be done in that area! You mention that you started another post about SC, but I don't know how far down the list it is or whether I'll get to that other post today, so I'm going to give you some advice here.
What do you think was going on in that GMATPrep test? When you look back over those questions, were you lost? Did you think a rule was one thing when it was actually something else? Did you get distracted by something that didn't "sound" right or vice versa? Were there times you narrowed down to 2 but didn't see how to pick between them - they both looked fine to you?
That last one often has to do with the meaning of the sentence. There's a difference between looking at two answers and thinking, "Well, I can see that the difference between the two is right here but I just don't know the rule" and "Hmm, they both seem okay. How can I choose?" How much have you studied meaning?
Here are some resources on meaning (and you can browse our blog for more):
http://www.manhattangmat.com/blog/index ... orrection/http://www.manhattangmat.com/blog/index ... on-part-2/http://www.manhattangmat.com/blog/index ... h-meaning/http://www.manhattangmat.com/blog/index ... problem-2/Were there sentences that were had such long underlines and were so convoluted that you felt like you weren't even sure what they were trying to say in the original sentence? And the answer choices were changing so much that you didn't know where to start?
Here are some resources for those kinds of sentences:
http://www.beatthegmat.com/mba/2011/03/ ... sc-problemhttp://www.beatthegmat.com/mba/2011/03/ ... -problem-2And, of course, if you have holes in your foundational knowledge of the grammar, then you know what to do there... :)