What mission do you want to do in the AF?
Your package looks good "sts" for OTS. That being said, I retired from AD in 2018. I applied to OTS when "W" was in office so things could have changed since then. It's a little harder to get the "mission" you'd like to partake in going the OTS AD UPT route. You will have to compete for slots with your bros (sts, kinda like real life lol) that are made available by the needs of the AF.
I flew helos. I wanted helos. I told all the dudes in my UPT class that helos were gay, but I told all my instructors from day one of UPT that my balls were too big for a fixed wing. Lol. In all seriousness, for AD dudes, UPT is like a reality show where you compete against your bros to get whatever the airforce has available for you.
ANG and AFRC already know what they will be flying. I imagine that removes a little stress from the competition at UPT.
To answer your questions:
1. Your extra curriculum seems applicable for an OTS application.
2. School name probably matters a little. IE. 3.7 from Harvard vs 3.7 from Devry Diesel Driving Academy.
3. Maybe some volunteer work?. Not sure on this one. You just wanna make yourself look motivated and leadership minded.
These answers are very basic and apply for OTS. Im not versed in the ANG, AFRC hiring process.