Credits are calculated by semester, and there is a summary of credits every semester, which will be counted when you graduate. At this time, the importance of credits is reflected, because each school has its own evaluation criteria, and students need to get the corresponding credits to graduate. If you can't reach the credit score required by the school, you can't graduate. If you reach the credits required by the school in advance, you can also graduate in advance.
Some schools also charge tuition fees according to the credit system, that is, the credits earned each semester correspond to the amount of tuition fees in the coming year. The higher the credit, the less the tuition, and the lower the credit, the more the tuition.