Is SAT Sparknotes helpful?

I have about 2 days left for SAT chemistry subject test. I barely studied. What do I do? Can I just review sparknotes chemistry and review all chemistry questions in princeton review test book? What should I know? Any tips? I just want a 600-650

It is the worst book for physics

Very unspecific and dumbed down. I guess you could read Sparknotes first and then move on to another, more challenging book.