Certainly the stress, lack of sleep, and over-work during the final few days would have affected you, and those factors would most likely affect you more as you get later in the test (and more tired out). So those factors are certainly at least some, if not all, of the cause for the score drop on verbal.
It's also possible that you over-studied from MGMAT sources and didn't study enough from OG sources. On verbal especially, there can be subtle differences in language and structure between different question writers - and the people writing MGMAT stuff are obviously not the same people writing official questions. It's important to make sure you do a good mix of the two - our explanations are often easier to learn from, but their questions are written by the same people who write the questions that you'll see on the test.
Reg. timing it wud be difficult for me to say how I went since both sections were finished at around the last minute.
While it sounds like you did finish both sections on time, you may have misallocated your time between questions. We can't, unfortunately, get any data from the real test, but you can do an analysis of your MGMAT tests to see whether this might be an issue. Use this article to do the analysis:
http://www.beatthegmat.com/a/2009/09/23 ... tice-testsAlso, here are some articles on stress management:
http://www.manhattangmat.com/stress-tips.cfmhttp://www.manhattangmat.com/strategy-series-stress.cfmIn terms of studying better for the next time, try these articles on how to analyze various kinds of verbal problems. And, in particular, concentrate a bit more on OG and GMATPrep sources for verbal Qs. (Note: you should go back and look at problems you've already done. Do the below-described analysis on those problems.)
http://www.beatthegmat.com/a/2009/10/09 ... ce-problemhttp://www.beatthegmat.com/mba/2010/03/ ... c-questionhttp://www.beatthegmat.com/mba/2010/01/ ... r-questionhttp://www.beatthegmat.com/mba/2010/02/ ... e-questionAlso, as you get ready to re-take, mimic the official test-conditions even more. Get in your car and drive around for 40m if you have to. Take the test in a library or someplace not very physically comfortable. (We're generally way too comfortable at home. :)
And if you weren't doing this already, make sure you have a very consistent sleep schedule leading up to the test. Go to bed at the same time and get up at the same time every day for at least a week before the test. Think about what you should eat and drink to give yourself long-term brain energy (complex carbs, protein, and a little fat - sandwich on whole-grain bread, eggs and whole-grain toast, nuts, granola or sports bar without too much sugar, etc.)