In 202, the customs officer reads the problem by voice, solves the problem, and if you make a mistake, solves only the wrong problem again.
The shortcut to passing the certification exam is to solve a lot of past questions.
In 2020, the customs officer AI artificial intelligence automatically solves past problems
Read it, solve the problem, and if you get it wrong, give the correct answer again
Just reading it and listening to it comfortably will help memorize it.
**Wrong problem seal breaking function added**