Look, Latin Library is my best friend when I’m this fried and still wanting to give grammar lessons so I’m just going to post links, I’ll go more in depth if asked once I pul myself back together:
EVERYTHING:
http://www.thelatinlibrary.com/101/
But specific to the AP what’s important is:
http://www.thelatinlibrary.com/101/IndirectSpeech.pdf Ceasar is writing in the 3rd person, so know your indirects!
http://www.thelatinlibrary.com/101/AblativeAbsolute.pdf He absolutely loves using the Ablative Absolute. If it’s multiple choice and Caesar and asking about an ablative and it gives you two words, it’s usually this
http://www.thelatinlibrary.com/101/GerundGerundive.pdf My favorite grammar thing, learn it, love it, it’s amazing ❤
http://www.thelatinlibrary.com/101/Supine.pdf Caesar mostly uses the ACC version and Vergil uses the ABL version more often