I decided to post a full write up based on reading others' posts here.
My main struggle was sentence correction. When you reach the 600-700 and 700-800 sentence correction problems on the GMAT, and can narrow it down to two choices and get stuck, it's almost always an idiom problem. If you're well versed in proper English literature (something I've been out of contact with for some time), it should be fairly easy to pick the right one. I also had a bit of trouble on quant. Mainly because I would solve for the unknowns of the problem and not actually answer the question asked (the the test writers always have an unknown as one of the answer choices).
Key points for those with similar issues: SLOW DOWN when reading the problem. On the exam, it's a good idea to allocate ~2 minutes per problem on both sections. Some problems will take a bit longer, and some a bit shorter, but DO NOT let yourself get stuck for too long. Missing easy questions and not answering questions at all hurts your score a lot more than missing hard questions. Practice setting up quant problems (data sufficiency or otherwise) and always make sure you're answering the question asked.
Honestly, the best advice I can offer is make sure you give prepping for the exam its due time. There is not secret recipe here. Focus on the weaknesses.
My experience on the GMAT:
Try 1 (Dec 2007): Practice exams were maxing at 640, and based on what I read on forums and based on what people told me, you usually score higher than your practice. I slept well that night, woke up, and made my way to the testing center (nearest one was 50 miles away). Finished both sections and I felt "well" overall. Clicked to receive my score, 610. Not terrible, but not good enough for top tier programs. Never mind that, I applied anyway, but as expected no dice.
After speaking to people on list serves I'm a member of on the topic and reading online reviews about the various prep programs, I decided to sign up for the
Manhattan GMAT (
MGMAT) online course. It's less expensive than the Kaplan or Princeton online programs and one particular person I was speaking to started in the same boat as me (560 on first practice) and broke 700 after the
MGMAT program. The class itself is like any other class room (albeit online). The instructors engage students to chime in and answer questions, and also answer questions during and after class. The out of class work (homework if you will) is VERY demanding. You will need to allocate ~10 hours/week outside of the class to finish all the material. Given my work schedule at that time demanded quite a bit of travel, the out of classwork was put on hold for ~5 months. My online account was set to expire, but I emailed the
MGMAT group to see if my access could be extended for a bit, as I could not give the program its due time when I was enrolled and there is a lot of information online (problem sets, labs, practice exams, etc.).
MGMAT was kind enough to extend my access for six months (
MGMAT offers that for a fee, but it was given to me for free).
Finally, after my last trip for work (March 09, but I'll probably start traveling again soon), I buckled down and studied. From March-May I was finish the online content, while taking the last couple practice exams (
MGMAT gives you six practice exams, and you can reset them (by request). The problem is problems might repeat after the reset (
MGMAT assures no question repeats between the six exams). Then May-June I buckled down where I was still struggling the most. I then took the two GMAC practice exams. Practice exams began in the 550-640 (inconsistent scores)when I finished the
MGMAT program I was in the 670-680 range (consistent scores).
Try 2 (June 2009): Felt good the day before the exam. Went over maybe 15-20 problems that day (problems I had already done and wanted to ensure I understood how to approach them/why I got them wrong). Other than that, did no studying and just relaxed. Tried to sleep that night, and did not sleep
at all. Ended up rolling out of bed at 4:30. Did the normal routine an hour later (morning prayer, breakfast, etc.) and then made my way to the testing center. Felt terrible as the food in my stomach was not sitting too well. Exam started at 8am. Went through both essay sections without too much trouble. Quant: Got stuck on some easy problems I REFUSED to guess on. Thankfully, I made up time on other problems and finished with more than 30 seconds to spare. Got stuck on a couple sentence correction problems on the verbal section, but still finished with more than 30 seconds to spare. Note: I had a much WORSE feeling the second time about my score.
Thankfully, on try 2, I broke the 700 mark. I think I was more stressed this time as I was answering harder questions overall (due to the adaptive nature of the exam). Not sleeping probably didn't help either. I scored both the highest I've ever score on the individual parts and the highest overall score (between both the real and the practice exam).