Instruct: Classify Amazon reviews into positive or negative sentiment
Query: It doesnt work , at least for me and friends

I practiced this technique some time ago, and after go to college to study again, the subjects that were really hard for me, seem now much easier to study, and i get much higher marks, one of my friends too.perhaps my "IQ" as defined in test has not changed, but my ability to understand subjects it's way better!! and now i not only pass!!! get good marks in hard subjects as algebra has improved a lot!!I think my intelligence has increased, althought an iq test said the contrary, i feel a lot of my abilities has improved.this book for me it's 5/5! thanks Win wenger!I am sorry i cant change 1/5 to 5/5 ;(-----------------------------------------------------------------------