Hello
From what I know of this site, no one can tell you if you can get in. There are to many factors that go into determine your chances of getting in that no one can tell you. What we can tell you is what you can do better at so that you increase your chances of getting accepted.
The high school grade point average of the Class of 2013 is 3.86. I'm not exactly sure what a "gpa in the high 80's converts to," but I think It is about a 3.5 on a 4.0 scale. It certainly wouldn't hurt increasing your gpa as much as possible. Starting this year, the academy would really like seeing you take some difficult class (AP, honors, college).
College entrance score average for the SAT is 1,294 (That is just Math and Verbal, so you need to get 650 or above on each). I would recommend getting some kind of study guide (from collegeboard, kaplan, etc., there are tons of good ones out there) and study as much as possible. Take as many practice tests as you can, I took two every week for 2 months prior to my SAT. You can take it as many times as you need and the Academy will take your highest score. You may also want to try the ACT, I have heard that some people are better at the ACT.
In addition to academics, getting some extracurriculars will help you out a lot. Sounds like you are doing good at sports. If you haven't gotten a varsity letter in wrestling yet, try your best to get one. Also, Try to become team captin. The Academy likes seeing well-rounded individuals. Try to find a club or group where you can practice leadership (e.g. boy scouts, CAP, JROTC, School President, etc.). The Academy wants to see you excel in a leadership position.
If you already have really good upper body strength from wrestling, start running now. The altitude is over 7000ft and if you are not in shape, it will be he** for you.
One last thing that might help you out that I wish I had done. Start writing down reasons that you want to go to the academy. You have to be your only motivator: not your family, pride, financial status, or any other reason except just being passionate about wanting to become an officer in the United States Air Force.
I hope this helps you out. Just try to get involved. Try to do stuff that will tell the Academy that you are not just an average student.
Brian Andre