Unnecessary Barron's Chem Chapters/Topics?

I was going through Barron’s and felt some of the information in the book was excessive. For those who have used Barron’s and sat for the subject test, which chapters and topics are the least tested/won’t be on the SAT 2? Is anything from the laboratory chapter actually tested or is it just common sense? Also, do I need to learn any historical info?

I think the historical info is not really important but you need to remember who found who by which method. Lab equipment and the uses are all you need to know in the lab session, but the book doesnt provide enough info on that though.