motivation

My AP chemistry test is about three weeks away and I'm having a lot of trouble finding the motivation to study for it and attempt to pass it. In order to pass the AP test, I have to get one-third of it right. Sounds pretty simple, right? NOT. We started reviewing material to prepare us for the test about a week ago, and I don't remember anything. My teacher gives us quizzes on very old material that we learned during first semester, and everyone does very poorly because nobody remembers anything that we learned during first semester. There are also review sessions held after school in a classroom with a teacher that can help us answer questions we may have. I wish I had the motivation to do well on this test, but I just can't find it! Since what we get on this test doesn't affect our grade for the semester, it's hard for many people to find the motivation. Especially for seniors who are graduating in about a month, it's even harder because we seniors tend to not care about school anymore. =)