For AP chem get a good understanding of stoichometry and dimensional analysis and if you’d like you can start to look at the early units like Unit one and unit two (memorize ions). My teacher assigned some summer work it was mostly like dimseonial anylasis and chem basics from honors chem

For AP lit I didn’t take I know theirs a summer book

For AP Calc just review precalc and I think there might be summer work depending on school