Well... I took SAT2 Chem in May and it was pretty hard... I was kind of confident with my chem (I got A's throughout year and got 5 on AP exam) and i thought that i'm gonna get 800 on chem but it was not that easy(got 770).... there were few things i didn't know when i took the test. first the complex compounds. second the molecular properties. third chemical equations (well. i learned it but i forgot.... anyway...) basically SAT2 Chem was all concept things... you have to know what reacts with what to make residues and which compound has higher melting point, and that kind of things... I'm gonna take SAT2 chem in Nov again.... so.... let's keep it up!!!^^
Good luck for your SAT2 Chem prep!!!