Dear Sir,
It’s a great question. It is technically possible you can get an offer, but you are right that since there is so little time, what the colleges will look for is PROOF of your improvement. Sooo even if it’s just 6 months, but if you have a better GMAT and a good promotion, then yes in can make a lot of sense to reapply. But if you have nothing new to add, it can be more difficult.