I kind of agree that it is risky, although I also feel it may just be a matter of me panicking when that timer starts going. There are definitely a few weak concepts that I need to practice, but I think a lot of it is I see a question and it usually takes me a bit to find the right approach, then I run into some speedbump like having to do a lot of long division or add a bunch of numbers up which takes up more time, before I know it the 2 minutes is up and I panic and just have to move on.
I guess it may be possible to improve my score in just a few weeks if I start practicing with the timer more. I really don't want to postpone it, not only for apps but because I've been studying for this test for years and it is pretty hard on my self esteem when I still can't do it. 690 is not bad, but I'm from a non-quant background, the only 2 C's I ever got in college were both math courses and I only have a 42 on the GMAT, so I feel I need to do all I can to prove myself in this area. This site has been very helpful and inspiring though!