Beat The GMAT a GMAT & MBA community

Guys please advise-
Gmat-570- not even near to my practice scores of 630-680 on manhattans and Gmat preps.
Work ex-6 years-Mechanical Engineer( india and middle east-working for a ENR top 100 consulting firm)
Avg GPAs
Good extracurriculars-Sportoholic-cricket-football-basket ball-whatever u name it, i play it.
Some social activities- Started the voter registration drive in 2003-covered by The Indian Express-leading indian daily.
Hobbies- crazy about trading in indian equities. Have done it succesfully with handsome gains even in the time of crisis.

I wish to apply to the above said two schools.I am inclined towards Manchester.Please advice.The minimum req GMAT for these schools is 550.I might retake the GMAT if possible in feb.

Awaiting healthy discussion and suggestions