saub,
I'm no forum guru. I'm not sure what Manhattan Review is. I used
Manhattan GMAT:
https://www.manhattangmat.com/This, to me, looked like the best program at the time. People spoke well of the program online, the company says their alumni average 690 - 700, and after the class they leave your access to the sight on for three months. When I called, the sales rep told me that if I called back after the three months that they would leave access on for another three months. I'm sure someone out there can tell me why all my reasons were illogical and stupid, but I went for it and it worked out for me.
I was
petrified of the GMAT. I initially thought I would be stoked to get a 620 or so. I ended up with a 710 (V98%, Q70%), and feel it was sort of an off day for my quant. I feel strongly that there's no such thing as a "top score", meaning a score threshold over which you'll never cross. I'm positive that had I taken another six months to study I could have taken apart my problem with certain kinds of quant problems, gotten better at them, and then scored hire. I also feel that had I picked up some really thick literature and read it every night for six months, my verbal score would have been higher.
I agree with topmbaseeker that what matters most is that you are persistent and committed to your goal, but I would add that
Manhattan GMAT gave me tools to solve problems that I would not have come up with on my own.
Bottom line to a babbling response: I would get some help. I'm glad I did.
Talking about the GMAT stands the hair up on the back of my neck because I studied like mad for six months. Let me know if I can help.