"Grade inflation" refers to the situation where grades in schools or universities are consistently higher than they used to be, making it easier for students to achieve higher scores than previous generations. Full definition
The fear of grade inflation should be dealt with by a national reference test. (schoolsweek.co.uk)
They might struggle to learn it since they experienced massive grade inflation in school. (inc.com)
Given the rampant grade inflation at all levels of American education, grades earned by students in even the most elite traditional private schools can not be trusted. (educationnext.org)