Sorry to hear that things didn't go your way on the GMAT this time around. It sounds like the best bet is for you to relax a little bit, focus on finishing off your CFA and work obligations, and then deal with the GMAT starting in June. If you're looking for an 80-point jump, then you'll want to prepare for the GMAT when you have plenty of time to devote to your studies, and it doesn't sound like this is a good time for you to do that.
Just as importantly, I don't see any good reason for you to be in a hurry. MIT's final application deadline for this cycle was back in December, and you're awfully close to the final deadlines for most of the programs on your list with fall intakes, so you're likely to be at a disadvantage right from the start. You might as well take your time, beat the pulp out of the GMAT over the summer, and then you'll be ready for first-round applications--or possibly a shot at a January intake if you prefer--by, say, September.
I hope this helps. Good luck with everything!
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