As you noted, it's important to figure out what led to the score drop - if we can figure those things out, then we can tackle them. The illness certainly contributed. You also mention timing problems. You may want to look at this to see whether any other ideas pop up:
http://www.manhattangmat.com/blog/index ... ent-wrong/Re: time management, have you read these?
http://www.manhattangmat.com/blog/index ... to-win-it/http://www.manhattangmat.com/blog/index ... nt-part-1/Start practicing what they say right away. :)
Your issue at this point is not how much you study / how many tests you take / how many practice problems you do. Your first issue is to figure out HOW to study effectively. As you do that, you may go back and re-do many of those OG problems - because you probably didn't learn as much as you could have your first time through.
Read this; pay particular attention to the "how to learn" section:
http://www.manhattangmat.com/blog/index ... an-part-1/http://www.manhattangmat.com/blog/index ... an-part-2/Also if you discover that careless errors are part of your problem (and they usually are for most of us, particularly when timing problems are present):
http://www.manhattangmat.com/blog/index ... -the-gmat/If you'd like to get some more detailed advice, then we need data on your strengths and weaknesses. Use the below to analyze your most recent MGMAT CAT(s):
http://www.manhattangmat.com/blog/index ... ice-tests/Then come back here and tell us the results of your analysis and what you think you should do based on that analysis. (Note: do share an analysis with us, not just the raw data. Part of getting better is developing your ability to analyze your results - figure out what they mean and what you think you should do about them!)
Re: the practice tests - set those aside for now. Don't study them, don't even look at them. Forget them. You've already got enough data to figure out a 2-4 week study plan. Then, you may be able to repeat GMATPrep and MGMAT CATs without remembering all of the questions.
Follow a few guidelines to minimize the chance of artificially inflating your score via question repeats. First, anytime you see a problem that you remember (and this means: I know the answer or I'm pretty sure I remember the answer, not just "hmm, this looks vaguely familiar..."), immediately look at the timer and make yourself sit there for the full length of time for that question type. This way, you don't artificially give yourself more time than you should have. Second, think about whether you got this problem right the last time. If you did, get it right again this time. If you didn't, get it wrong again. If you *completely honestly* think that you would get it right this time around if it were a new question (even though you got it wrong last time) because you've studied that area and improved, then get it right this time.