As a former student of Sir Thomas Rich's grammar school[1], I am reminded of their grading scheme combining effort [A-E] & attainment tier [1-5]. Often the two marks were linked (A1, B2 etc), but the coveted low-effort:high-attainment grades did show up occasionally. I recall a friend of mine receiving a D1 grade: he essentially belligerently phoned it in for the effort quota, but somehow got the right answers.

[1] https://strschool.co.uk