Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: CD-ROM attached never worked

Only seven problems in the practice exam works, after that everything is messed up. Something wrong with the CD. AMAZON's service is A+, they sent me a new one immediately but the CD has the same problem. Checked with different computer still did not work. I believe all the CDs with this book have the same problem. I did not ask refund because of the good service of AMAZON. But disappointed at Kaplan.