This article deals with the testing of the achieved language skills of students in a higher education institution. Various forms of testing are reviewed, including the phenomenon of electronic testing (e-testing). A common problem when testing is the validity and the reliability of the tests. It is for this reason that for the research a standardized tool - mock test - was used and converted into electronic form. The aim of the research was to verify, through the aforementioned tests, whether students of English at the Institute of Technology and Business in České Budějovice (ITB), after completing the first two semesters of general English (the course was preceded with English acquisition at primary and secondary schools), actually achieved a B1+ level according to the Common European Framework of Reference for Languages (CEFR) for the written part of the test.