Hi Pretzel,
I'm sorry to hear that you were unhappy with your results. I know that you devoted a lot of hours into prepping for the exam, so there could be a lot of factors that affected your performance.
First, I'd advise you to take simulation and practice exams in real conditions and at roughly the same hour of day. On exam day, do exactly what brought you success when practicing. It seems that there were elements (other than the questions) that through you off. So, by doing this, you can feel more and more confident by the time you enter the exam room.
As you prepare to retake your GMAT, also consider these tips on retaking the test:
1.Try to forget your last GMAT experience as much as you can. Don't be afraid of your last performance and don't let it affect your confidence level. You know what to expect now and you are better prepared this time around.
2. If you felt scattered in your studies and used multiple sources without a proper pedagogic line to follow, find a prep plan that works for you. This will streamline your learning and boost confidence.
3. Remember to practice all parts of the exam. You can spend your time focusing on your weakness, but it helps to hone in on your strengths. (If there were specific parts of the exam that threw you off, let me know)
4. Improve your time management.
I'd also recommend meeting with an online tutor to help you build a strategy that works for you.
I hope this helps. Best of luck prepping!
Jessica