Can a B2 license be upgraded to an A1 license?

[Melo]

To upgrade from a B2 license to an A1 license, you must hold a medium-sized bus B1 or large truck B2 license for more than five years, and have no full-point records in the last three consecutive scoring cycles before applying. The upgrade can only be processed at the registered residence. Below is relevant information: B2 License: Permits driving heavy, medium-sized trucks or large, heavy, medium-sized specialized operation vehicles. Heavy and medium-sized trucks mainly include trucks, such as the large dump trucks commonly seen on roads. Large, heavy, medium-sized specialized operation vehicles refer to vehicles equipped with special equipment or devices, such as water sprinklers, concrete mixers, fire trucks, etc. A1 License: The permitted vehicle types include buses with more than 20 passengers, and passenger vehicles with a body length exceeding 6 meters must also use an A1 license. Other vehicle types permitted by the A1 license include: A3 (city buses), B1 (medium-sized buses), B2 (large trucks), C1 (small cars), C2 (small automatic transmission cars), C3 (low-speed trucks), C4 (three-wheeled cars), M (wheeled self-propelled machinery). Only an A2 license can drive full trailers and semi-trailers, which the A1 license does not permit.