Hi Davis925,
Very sorry to hear about your GMAT experience. Reading through your post, I can think of 2 main reasons why you performed so badly in your real GMAT as compared to your mocks:
1) Over studying leading to the exam - If I'm not wrong, you were pushing yourself to study beyond your comfort level in the last 1-2 weeks leading to the exam? That would be the main reason why you got really anxious and just wanted the exam to get over with - NOT a good emotion to go into the exam with.
2) Pressure during the exam resulting from the aforementioned anxiety - Considering that you were uncomfortable during the exam and also nervous, it is ighly likely that your score dropped so much from your mock levels. Clearly, you have the basics in place but could not execute during the real GMAT.
NEXT STEPS:
Now this is the main part. Nothing can be done about what happened, but you can prepare for your next attempt. Here's what you need to do (and in that order):
1) Mindset - You need to stop hating the exam and stop getting anxious over it. No amount of preparation can help you if you burden yourself with hatred, discomfort, and anxiety. So I would suggest that you take a break for couple of days, travel if you can, or just go have fun and let out some steam. And make sure that you come back with a positive mindset.
2) Quants - As you mentioned, you struggle with quants and would need to work on it.
(a) Strengthen your basics - Start with the basics, and go through every concept tested in the GMAT - use the Manhattan guides or the GMAT club math book for that. Then, start solving OG questions under timed conditions and keep an
error log. Check every question you go wrong and solve again later. Keep reviewing the concepts that you mostly get wrong.
(b) Practice different ways of solving problems - like using dummy numbers, backsolving, etc. You can go through this forum and find articles that explain these smart ways to solve questions quickly. This will support the strong basics that you build and help you solve questions quickly, thereby improving your timing on the quants.
3) Verbal - This section appears to be your strong area. I think you should just keep solving few questions every alternate day to keep your skills fresh, and spend most of your time in strengthening your quants abilities. HOWEVER, just to make sure that you don't anxious during the exam and are able to perform well on verbal under any situation - develop a strategy for each of its sub-sections and question types. This should be the strategy that you would apply on every question of that type, every single time. This should become second nature to you. This would help you in keeping calm during the exam and going with the flow as and when different question types appear.
4) Mocks - Write mocks every weekend and review it thoroughly to understand your weak areas. Then you can spend the following weak days to practicing and strengthening those weak areas. But as I mentioned before, develop a strategy and follow it during mocks without fail.
5) Simulate exam day environment and contingency plans - Finally, you should prepare your body and mind for the exam day. You know the pitfalls that you faced in your first exam, and can prepare for them for your next attempt. Follow the same routine, eating habits, and sleeping routine for your mocks as you would have on your real GMAT. If it's in the morning, go to sleep early and wake up early and then study. This will help you in getting accustomed to the early morning grind. Also, give mocks in uncomfortable situations so that you're prepared for any type of situation on exam day - like you were thrown off your game because you were feeling hot at the center. So give a few mocks in a hot uncomfortable environment so that you're prepared for it in case it happens again.
MOTIVATION - Go through the following debriefs for motivation and tips. It is possible to overcome the situation that you're in:
retake-experience-from-590-to-770-in-one-month-159957.htmlten-essentials-for-gmat-660-to-740-its-all-about-strategy-168560.htmlAll the best!