For those going to Vance. I found a welcome doc and it has instructions on how you can access all the academics/study materials before you start.
"Study Material: Even prior to arriving at Vance AFB, you have the opportunity to begin your path towards wings. Once you have your orders, contact the Sponsor Hotline at 580-213-5129 or 580-213- 6396 with your name, email, and Report No Later Than Date (RNLTD) on your orders. In turn, you will be given the username and password to our Box.com site. There, you will find the study materials you to start" Vance Welcome Guide 1.2.pdf
Maybe other bases have a similar set up for study materials.