The paper deals with results of the mathematics tests conducted at the University of Finance and Administration in Prague in school years 2015/16 – 2018/19. The tests consisted of three theoretical questions, namely basic definitions from linear algebra. Students’ ability to formulate these definitions is tested and the success of the formulations is evaluated. The results obtained in four consecutive school years are compared and any potential trends in growth or decline in student performance are examined. Moreover, the correlation between student’s ability to formulate definitions and his/her gender is examined.