I had the lowest score on my chem exam
Are you going to study harder for the next one?
I just know I'll always be the worst no matter what happens..
I'm sorry you got the lowest score on the exam. You should work to do better on the next one instead of giving up. Perhaps you could work with a tutor.
I don't see why I should keep trying...
Grades are important, so you should try to study hard next test.