There are also self-study exams. What is the entrance exam? There is no such thing.

Caida is also a student. It depends on studying hard and reading more textbooks. This course should be very simple.

Most self-taught students have to go to work. Generally speaking, it is not difficult to clear customs in three or four hours at night. Perseverance is the most important thing. This is what the self-study exam needs most.