overmark
/ˌəʊvəˈmɑːk/verb
1 [with object] To make a mark over or on the surface of; to superimpose a mark on.
2 [with object] To give particular or excessive emphasis to; (Linguistics ) to make excessively marked.
3 [with object] To award too many marks to (a candidate in an examination, competition, etc.).
Origin
Mid 16th century (in an earlier sense). From over- + mark.