You haven't mentioned a goal score. Are you pretty close to your goal score already? Or do you still have a ways to go?
Did you take those practice tests under 100% official conditions, including the essays? If you deviated from official conditions in any way, tell us how - deviating from official conditions can result in artificial score inflation, which means that you would need to do more work before you could expect to reach that same level on the real test.
Next, do you already know that the scoring scales for quant and verbal are not the same? 47 to 49 on quant is in the 80s, percentile-wise, while verbal 33-34 is in the high 60s / low 70s. Raising verbal by at least 5 points would put you in the mid-80s or higher, comparable to your current quant score. If you're going to do the work to get that kind of verbal score, you should also be trying to raise quant, because quant is already your strength.
You mention that you are about 3 weeks away from your test date and also that you have to cram your study into 2 days over the week-end because of your work schedule. Unless you are already roughly in the range that you want to score on the real test, you should consider taking more time. If you want to hit 50+ points higher (especially if you took your practice tests under non-official conditions!), then 3 weeks is typically not enough time, especially given that you are really only doing 2 days a week.
Note: I know that you have to study this way because of your work commitments, but you should know that the same amount of time spread over 7 days is going to be a lot more effective than the same amount of time spread over 2 days, especially with a 5-day break in between every 2-day study period. Your brain just doesn't learn as effectively or efficiently when you study in that way. That means you have to take into account that it may take you longer to get to your goal.
Okay, now that we've got all of that out of the way, let's talk specifics. On RC, are there any other differences that you noticed? Did you get more passages of a certain type on the MGMAT tests than the GMATPrep test? Or certain question types? Maybe you really struggle with Social Science passages or Inference questions and you happened to get more of one type on one test. Go look at the passages again - did you happen to like the actual topics on GMATPrep more than MGMAT? That happens sometimes - sometimes it's just luck.
What about timing? Was your time fine for both? Or did you have timing pressures on one that might have caused you to have to read / work more quickly and thus make more mistakes?
What about official testing conditions that might have affected your stamina (remember that verbal is the last section)? Did you, for example, take the essays on one test but not the other? Take longer breaks on one test than the other? Etc. Anything that would have made you more tired on the "worse RC" test and that could have affected your reading speed, comprehension, etc?
Re: the rest, I need more data from you to advise you. Use the below article to analyze your recent MGMAT tests, then come back here and post your analysis (not just the raw data - include what you think the data means, because you have to learn how to analyze yourself!). Then we'll tell you what we think.
http://www.beatthegmat.com/mba/2011/02/ ... sts-part-1Also, you mention using the MGMAT SC and CR Strategy Guides. What other resources / materials do you have available for your study?