GMAT Strategy

First, take some time immediately (right now!) to go write down (or type out) EVERYthing you remember about your experience during the real test, good and bad - problems, pacing, energy, stress levels, everything. We need to figure out what went well and what didn't go so well for you.

Next, either take a new practice test or go back to your most recent one (as long as it's within the last couple of weeks) and start to analyze that thing. Ideally, do this from a test prep company's test since GMATPrep doesn't give you any kind of analysis on your performance. Take a look percentage correct, timing, and difficulty level across the various categories of problems and content areas and make a map of your strengths and weaknesses. There are basically four main designations for a particular question type or content area:
1) I tend to get these right and I do so within the right amount of time
2) I tend to get these right but NOT within the right amount of time
3) I tend to get these wrong but at least I don't spend too much time
4) I tend to get these wrong AND I spend too much time doing so

In verbal, you need to do this for each of the major grammar categories for SC, and for each of the major question types for CR (find assump, draw conclusion, strengthen, weaken) and RC (main idea, specific detail, inference).

Once you figure all that out, come back here and tell us the data and we can help you figure out a study plan from there!

Also, just know for future that your test scores on practice tests taken close to the real test (especially PowerPrep or GMATPrep) will be right around where you should expect to score on the real test. It's unlikely that you would take a GMATPrep a week or two before the real test and then improve by 60 points a week or two later on the real test.