A good thing for you to do is make a list of all the things you are concerned about and bring it to your FJC. The FJC spends alot of time going over how to determine if you have a malfunction or not and what to do to fix "problems' including what to do with 2 canopies out (this is not always a good thing..more is not always better). It may touch on how an AAD works (it doesn't cut away your main, it deploys your reserve), but if they don't explain it to your satisfaction, have them address your questions at the end of the class.
I'm not sure how in depth your FJC will go into AADs- the one I took didn't go into it much because they want students to learn emergency procedures and not rely on a device to deploy the reserve for them. Alot of people are overwhelmed with their first jump, so the FJC drills in the stuff you really need to know to start and builds on the information on your subsequent jumps.
Don't try to overthink things, and don't expect to learn everything you will ever need to know about skydiving in the FJC. Alot of people have a hard enough time just getting out of the plane, so while you may be able to take in and retain alot of information, other people can't. There are many stories of students who do their first jump, perform maneuvers under canopy, land in the bowl but don't remember anything after leaving the plane. Don't stress yourself out, learn your EPs, ask questions and listen to your instructor, trust your gear....and have fun.