We add new questions all the time, but we don't remove questions unless we decide something's wrong with them for some reason. So, yes, you may see things that you saw 2 years ago. I'm surprised that you can remember questions from that long ago! You must have a really good memory!
I think 570 is a good starting point, too. Yes, it does sound like you have timing issues (not unusual). This article can help:
http://www.beatthegmat.com/mba/2009/12/ ... managementI think you would also benefit from a timing exercise: learning about how long one minute is without looking at a watch or stopwatch. If you don't have one already, buy yourself a stopwatch with lap timing capability. When you go to do a set of problems, start the stopwatch but turn it over so you can't see the time. Every time you think you're one minute into a new problem, push the lap button. When you're done with that problem, push the lap button again, then repeat the process for the next problem. When you're done with the set, see how good you were - and whether you tend to over or underestimate. Get yourself to the point where you're within 15 seconds either way on a regular basis (that is, you can generally predict between 45 sec and 1min 15 sec). Also check your timing for the entire question, of course.
Now, how do you use that when doing problems? If you're not on track by one minute*, make an educated guess** and move on. (The general idea is that if you're not on track by the halfway mark, you're unlikely to figure out what's holding you back AND have time to do the whole problem in the 1 min you have left.)
* For SC, 1min is well beyond the half-way mark (we're supposed to average about 1m15s here), but you can almost always eliminate at least some choices on SC in that timeframe. Once you've got that "I'm around the 1min mark and I'm struggling" feeling, go through any remaining choices ONCE more. Pick one. Move on.
** This also requires you to know HOW to make an educated guess depending upon the type of problem and the content being tested. So that's something else to add to your study: how to make educated guesses on different kinds of problems.
For content, start with Algebra and Number Properties for quant. What materials are you using to study? Do you still have your MGMAT books from your class a few years ago? What edition are they? (We're on edition 4.1 right now.) If you have 3.0 edition books, you probably don't need to update them - but if you have 2.0 edition books, you should consider getting new books, at least for the areas that you identified as weaker based on your first practice test.
Finally - because you took our course before, you can actually re-take it at a pretty significant discount. If that might be of interest to you, contact the office to find out details. If you do re-take it, then follow the syllabus for the course - that's your study plan!