In order to enter most MBA programs in the fall of 2010 you would need to apply in the winter/spring of 2010. Depending on the application round you submit your application in, a GMAT test date of February 2010 might be feasible. However starting to prepare for the GMAT in February of 2010 would probably be too late to allow you to take the test and submit applications by the winter/spring 2010 deadlines.