Instruct: Classify Amazon reviews into positive or negative sentiment
Query: DON'T BUY BOOKS FROM ETS!!! BUY FROM OTHER SELLERS!!

DO NOT buy any study material from ETS. I just bought a book a while ago for one test code, but ETS changed the test code and now I can't get a refund or even exchange on my book. Also be sure you've registered for the right test and date, they will keep your registration fee!!! DO NOT BUY STUDY MATERIALS FROM ETS, BUY NEW/USED FROM SELLERS ON HERE....NOT ETS!!!