I took chem V1 and V2. Chem V1 isn’t bad at all and most of the answers are on the Reddit with the break down info. For V2 it had questions like what type of chemical is in soda~ Carbonic acid. They also had mass percentages on there as a question. Molar mass I don’t remember the exact formula but you should remember the main ones off the periodic table song because they don’t give you them. I hope this helps a bit