I wrote a few days ago and scored a 720. If you score 680 and above DO NOT REWRITE. There is no difference between a 680 and a 750. >680 means that you can handle the workload and intensity of an MBA program.
My 2 cents worth :
I started prepping for the GMAT about 8 months ago. A few Qs here and there. Did about 1 hr a week for the first month. Took the next few months off.
Don't waste your time with Kaplan
strategies courses etc. Use only the OG. Cram . I did about 2-3 hrs a night for 4 weeks then Wrote. The GMAT is a fitness test. If you leave it too long you will get sloppy. Focus and study for 1 month solid. I felt the Math was just as easy as the OG. Verbal was like taking the toughtest 41 Q from OG. There is no evidence that the Questions get harder. They are the same throughout the test. Don't waste your time with probability. I got one and it was easy. Similar to the OG ones.
Buy the OG for $35 study for 6 weeks then go write. Then never look back.
My feeling about the GMAT : You have to write it, so do so BUT it is an absolute waste of time and utterly useless. I learnt nothing from it whatsoever - apart that it was a pain in the rear and that I lost valuable time with Family. I'm glad it's over. What a load of crap.
Good luck to everyone else.