I think one of my biggest mistakes was protracting my study period. I started studying in April and took the test in September. Six months is just too long but I was so paranoid that I wouldn't do well because the first two months of studying were sporadic. I think my strategy backfired because, like you, I lost steam the last month and really wasn't motivated to take the test at all. Consequently, I bombed the test. I think 1-3 months is a more realistic study period.
I'm taking one more month to work on my weaknesses (DS really) and then I'll go from there. I have my #1 school application ready so all I need is a 600+ (I'm going for P/T programs). Sometimes you just have to roll with the punches. So long as I know I put 100% in the test (and in my preparation), I'll I'll be content going to my #2 school if things don't work out. Ultimate goal - I want to get my MBA ASAP.
Regarding your weaknesses, keeping an
error log may help you; I know it has helped me lately. I keep a running log of all my errors. Before I start new content on the following day, I review all my errors from the previous day (and other days) and make sure I understand the content. I will continue this process until I get it all right.
Hang in there...