I'm in this business. I don't know if I've studied it. If you have a strong self-study ability, it is actually no problem to buy two books for a few months. There are many customs declaration schools here in Dalian. What Xingang, Jincheng, customs declaration school. There are also large and small trainings. If you want to go to school, you should train for at least 1000 a year, which is about 2000 yuan. After going to work, it will be more than one month 1000, which is basically the case.