Yes, after the A/B certification training period ends, a test is required. You can apply at the vehicle management office in the place where the driver's license is issued.
According to the regulations on the application and use of motor vehicle driving licenses, Article 13
Newly obtained large passenger cars A1, tractors A2, city buses A3, medium passenger cars B1, large trucks Those with a B2 driver's license must take knowledge tests on road traffic safety laws and regulations, traffic safety and civilized driving, and emergency response within thirty days after the end of the internship period, and receive no less than half an hour of warning education on traffic accident cases.