The AP Chemistry Summer Work is basically a summary of the major units in the Honors Chemistry curriculum which encompasses multiple topics within mostly the first 3 units in AP Chemistry; Matter & Measurement, Atoms/Molecules & Ions, and Stoichiometry.
If you took honors chemistry the majority of the content should be familiar to you, however, there are numerous portions on content that now need to be memorized (such as your polyatomic ions and solubility rules, you will no longer have an oxidation sheet or solubility table).
The Summer Work document lists chapters in our textbook (scanned below in color or black/white) as well as some additional resources if you choose to look at them. Be sure to read the TEXTBOOK!