It is absolutely riddled with errors! It's probably too late now but buy the solutions if you plan on doing these problems. Without them, you won't even find the errors. I only did the AM section when I prepped for the exam last year. Like you, I did them just a few days prior to the exam.
I did feel working thru the problems was very beneficial to me despite the frustrations between the questions and solutions. I thought the breadth TFS problems for oughtright, specifically the fluids ones, were more realistic to the problems I saw on the exam than the other material I used for prep (but I was a MDM depth).