My suggestion to you: Retake the GMAT again. With your score and GPA you won't be able to get into any decent MBA school, and to pay so much money for a diploma that might not get you a job afterwards (as is the case with the less good schools) is often just not worth it. I am sure you can do higher on the GMAT, and I would say beating a 600 is a necessity, and if you can break the 650, even better!
Resist the temptation to rush things!
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