I am also studying for the GMAT and took three
MGMAT exams and I can share my experiences.
1. First Test, 580 (Q38, V38). Ran out of time with 5 questions, never got enough correct in a row to get 700-800 questions. Felt depressed and made me questions going further.
2. Second Test, 700 (Q48, V41). Still ran out of time with only 3 questions, but got several 5-6 in a row correct meaning I'd get many more 700-800 even if I got 2 wrong in a row, the question after would be a 700-800 question which I would get correct and it would rebound my score. Quant went up because I forgot many of the basic rules for RC, SC.
3. Third Test, 610 (Q35, V41). Totally ran out of time with over 10 questions remaining, got each one wrong. I tried to same strategy as Test 2 but what I didn't do is weigh out whether to get many right in a row or simply move onto the next question so I ended up actually doing worse. When you consider the first 24 questions though, I was at 90th percentile and even at question 30, I was at 80th percentile. Then I dropped to 50th percentile with last 10 wrong which brought my whole score down to 610.
So to conclude, I am going to change my game and do first 10 totally correct, then focus on time on next 10, then if I am really behind on the clock I will guess one, focus on one, guess one, focus on one, then alternate til the end. That is better because the occasional correct answers will keep rebounding your score and you will end up finishing with your last percentile which should be between 80-90th, which should get you near 45+ in Quant.
I will try this new strategy and let you guys know how it goes.
Good Luck!