Going to just tag along with all of the other comments here. Don't waste your time trying to learn knowledge ahead of time. There's a great skill in being able to take information given in a short amount of time, synthesize, and be able to brief back under pressure which at the time feels stupid, but the more you spend time in the Army, you become more and more thankful for. Take the time to keep working out, enjoy your last semester with friends, and show up with a good attitude. There's something to be said for being the grey man during an experience like Beast. Differentiating yourself by showing up knowing things before hand will bring you more attention from cadre which will not necessarily make the experience any easier or fun. You want to show you are a team player that is ready to learn how to follow and help others around you in a shared experience, not be an individual focused on making your trip easier.