Some people think that exams encourage students to study. (It is better to use specific words instead of “some people”)
à Most educators and policy makers agree that testing encourages students to study.
However, in my opinion, exams do not encourage students but impose false reasons to students that exams are necessary and therefore demand students to study anyway even they dont want to. (This sentence is way too long; better divide into two or three sentences.)
à In my opinion, however, exams do not encourage students.
Rather, they impose negative motivations to study on students, which results in keeping students from pursuing their academic goals.
Two paragraphs supporting my opinion follow below (it is better to use smooth transitional sentence)
à In fact, exams discourage students to study based on following two reasons.
Some suggestions for your introduction. I think your two supports are very strong, but you may include some sentences about what "real study" is and what "encourage students to study" means in your opinion. Good luck! :)