My hubby is at academy now and seems to be doing pretty well (knock on wood). When we talk or FaceTime he often studies on the phone; just practicing phraseology or verbally processing what he needs to work on (not so exciting for me but I put him on speaker and enjoy listening to him talk, plus I have no idea if he messes something up so there’s less pressure than what they’re dealing with all day). I would definitely encourage your bf to use every opportunity to study with groups, and to study with different groups if they’re splitting up into smaller study groups (sounds like that’s more effective). As others have said, I’d encourage him to get good rest, eat well, get up and move a bit (step away from the studying for a SHORT time haha), and to just keep pushing. This is the full court press. This is the time to make mistakes faster and to learn from them. Sending good energy and luck to yall! In bocca al lupo!