grading group meaning in English

分级复接群
分级群

Grade group plan
年级分组制
Data graph for qualification group 2 : school certificate grades group i
资历组别第2组：中学会考证书职系第一组中学会考五科合格的数据表
Data graph for qualification group 5 : higher diploma , diploma and related grades group ii
资历组别第5组：高级文凭文凭及相连职系第二组文凭的数据表
Data graph for qualification group 8 : technician , supervisory and related grades group i
资历组别第8组：技术人员督导及相连职系第一组证书或学徒训练加经验的数据表