What are the requirements for upgrading from a C license to a B license?

[SanCorey]

C license to B license upgrade conditions are as follows: 1. Requirements for upgrading from C1 to B1: Hold a C1 driver's license for more than three years, with no full-point record in the last two scoring cycles. No record of drunk driving, no record of bearing primary or full responsibility in a fatal accident, aged between 20 and 50 years old. Height must be at least 155 cm, and naked-eye or corrected vision must reach 5.0 on the logarithmic visual acuity chart. 2. Requirements for upgrading from C1 to B2: Hold a C1 driver's license for more than one year, with no full-point record in the last scoring cycle. Aged between 20 and 50 years old, and naked-eye or corrected vision must reach 5.0 on the logarithmic visual acuity chart.