S level

сокращение от Scholarship Level

Большой англо-русский словарь

S level

noun 1. the highest of three standardized British examinations in a secondary school subject used as a qualification for university entrance; also successful completion of an S-level examination in a particular subject — called also Scholarship level — compare A level, O level 2. a. the level of education required to pass an S-level examination b. a course leading to an S-level examination

Merriam-Webster's Collegiate Dictionary