How long after downgrading from B2 to C1 can one upgrade back to B2?

[Brown]

b2 downgraded to c1 can be upgraded back to b2 after one scoring cycle. The following is the relevant introduction to the B2 driver's license test: 1. Subject 1: Driving theory foundation, local regulations, road safety laws and regulations, etc. 2. Subject 2: Pile test, fixed-point parking and starting on a slope, parallel parking, passing a single-plank bridge, curve driving, right-angle turn, passing a width-limited gate, passing continuous obstacles, driving on bumpy roads, narrow road U-turn, as well as simulated highways, continuous sharp bends on mountain roads, tunnels, rainy (foggy) days, slippery roads, and emergency handling. 3. Subject 3: Road driving skills test, safe and civilized driving common sense test.