Advantages: strong pertinence, can consolidate the knowledge of superior disciplines, reduce repeated exercises and put an end to time waste. Teachers are humorous, and problems that cannot be solved can be solved in time. Other institutions or universities have internal skills, which is very useful for students who want to take an examination of famous schools.

Disadvantages: One-to-one teachers have high prices and uneven professional quality, which is easy to mislead students. Students can't think positively because of dependence, and they can't clearly locate their learning state without the comparison of their classmates. There is no such strong sense of urgency as exam ranking and exam, which is not suitable for students in the sprint stage. Non-graduating students can try it themselves. It is best for graduating students to review with school teachers within four months before the exam.