Correspondence study
Correspondence learning means that the school sends you textbooks, and you learn by self-study, TV lectures and using computers. Your communication with the teacher is through letters, emails, etc. And your homework is also handed in by mail or email. Sometimes there will be a few days of face-to-face study and examination, and you can get the corresponding certificate by passing the examination.
Studying at night university
Night college is usually a teaching method arranged for students who have already worked. Classes are usually held on Saturday and Sunday, and sometimes classes are arranged at night. There is not much difference between the examination form and the unified recruitment. It's just that the time is sometimes arranged for the exam at night.