升班的英文是???

The most straight-forward and commonly used term for 升班 is PROMOTION.

promoted to form X

to go up one grade=升班

to go up one grade

class promotion =+"

to upgrade
to grade up
to promote
to advance to the higher class
up level
update
本人只係識呢幾個

ｉhave upgraded

class promotion

i got move up to a higher level.