I agree with PilotMike, there's always more than one way to skin a cat. As time is the main issue here, why not get it all done and dusted as soon as possible? If you feel down after a receiving a dud aptitude results then the culture and atmosphere at somewhere like OAT could really get you downhearted.
Check out all your options and please visit these schools (make a short list) and go see for yourself. Pencil in a weekend and get out there.
Best of luck ....
