Selected for Army OCS — What Should I Study Before BCT/OCS as a Civilian?

I was recently selected for Army OCS and signed my contract. I ship out for BCT in November and will head to OCS afterward.

Physically, I feel like I’ll be pretty well prepared by the time I ship, but my biggest concern is military knowledge. I never did ROTC and don’t have any prior military experience, so I’m basically starting from zero when it comes to Army knowledge.

For those who went the 09S/BCT-to-OCS route, what would you recommend studying or memorizing before shipping?

Are there any specific books, apps, websites, study guides, or other resources you found useful for preparing for BCT and OCS? I’m not expecting to teach myself everything beforehand, but I’d like to show up with a solid foundation instead of learning absolutely everything for the first time once I get there.

Appreciate any advice, especially from recent OCS grads.