Took my GMAT in Dec, scored 650. Still waiting for AWA scores
Work Exp:
I am an Indian with around 6 years exp in Training and Development.
I worked as a trainer in the corporate world for around 4.5 years and now am working in a school.
Education:
Completed my Bachelors in Business Management with specialization in Marketing. Scored 65% avg
I have scored around 65% through 10th and 12th, both state boards.
I plan to apply for NUS, NTU, SDA Bocconi, Bath, Manchester.
Do I need to retake my GMAT? I definitely hope to get through a decent school by fall. If i have to retake I hope to do so in Jan end or feb beginning that way i can still apply for fall season.
Please, please, please let me know, what are my chances. I am real worried

Thanks in advance.