First of all, most college students only have a non-professional comprehensive knowledge, so they should continue to study and become experts in a certain field. If they look for a job after graduation, they may not perform well at work because of the relevance of their jobs. So students should go to graduate school after graduation.
There are many graduate students, but there are also some problems to be solved. Most importantly, people are discussing whether graduate students should do research and write papers. Some people think that they should get more opportunities to develop higher education. However, some people think that there is no need for students to prepare for leaving school. Personally, I agree with the former, because it will make them more valuable when looking for a job.