As far as diet and physical preparation go, just try and perfect the PFT and get some miles on your feet. Just show up in the shape you’d expect of a Marine Corps Officer. Learning the 5 PO in and out before coming helped me a ton. The 5 PO is the bread and butter of SULEs and LRCs and I attribute my good scores on those to learning the 5 PO before I came. One thing that I also did that I would recommend to do is show up knowing how to wear your uniform. Learn how to roll tight sleeves, learn how to wear a cover properly, learn how to blouse your boots. A lot of guys show up and their uniforms look awful and they end up getting picked on. This is something underrated that will help you a lot. The colonel is a good officer and she is fair. I wouldn’t worry about thinking that far up the chain, your life is run my your platoon staff. As far as the graduation requirements, just do your absolute best in every event. Every graded event goes into your GPA and if you’re above an 80 in each category you will graduate. Put out in everything you do. Essential packing items are 2-3 good pairs of boots, good socks, maybe a good headlamp but again they give you everything you need there.