How long does it take to upgrade from a C1 to a B1 driver's license?

[DeAlexandra]

It takes one year, with the following specific requirements: 1. The driver must have held a C1 driver's license for at least one year; 2. There must be no record of full demerit points in the scoring cycle prior to applying for the upgrade; 3. The driver must be between 21 and 50 years old; 4. The height must be at least 155 cm; 5. The naked eye or corrected vision must reach 5.0. Below is basic information about the C1 driver's license: 1. The C1 driver's license allows driving small and micro passenger vehicles, light and micro cargo vehicles, and light, small, and micro special operation vehicles (including all models under C2, C3, and C4). 2. The examination subjects include traffic regulations and related knowledge, field driving, road driving, and safe and civilized driving knowledge, totaling four items.