level of attainment

noun
  1. British education one of ten groupings, each with its own attainment criteria based on pupil age and ability, within which a pupil is assessed
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012