To sum up, part-time jobs can do lot more good than bad to students as long as they can make best use of their time and raise the efficiency of their study.

Exams:
Good or Bad
　　Some students complain that they have too many exams. They seem to be always engaged in preparing for all kinds of quizzes or tests without any time to do something that really interests them. They suggest that exams be abolished. However, all schools have exams towards the end of a semester or after a session. There are some reasons for doing that.
　　First, knowledge needs rehearsal to be memorized. As we all know, before each exam students are always kept busy doing preparations. They are expected to go over the course books one by one and try to memorize everything learnt. This can serve as a sort of rehearsal to what they have learnt and help store the newly acquired knowledge into long-term memory for later use.
　　Secondly, exams can act as a kind of evaluation as to how much students can understand what is taught in class and how well they can put the knowledge into practice. A student who understands all concepts and formulas in the math class will take interest in solving difficult problems. And if he does succeed, the satisfaction and contentment he gains from doing it are beyond description.
　　Thirdly, good exams can develop intelligence. By providing correct solution to each question students not only learn the methods of science but also train their ability to deal with difficult problems which will do them a lot of good in developing their thinking.
　　So examinations at school are necessary and helpful. Student can strengthen their knowledge and at the same time develop their intelligence.