Off of what slice said: I'm a year from graduating and have been told "talk to us next year" by several units. Then again, I've also interviewed at a few units. Short story is: it varies.
Good luck getting a medical before you're selected. USAFR used to FC1 dudes before they were sponsored, but no longer. My regional officer recruiter said it costs about $1 million to do an FC1. I'd love to see the line items for that.
Take the AFOQT and TBAS soon so that you can take it again if you **** the bed the first time.
Good luck.