We created the tests ourselves. We made two equivalent test forms, the structure of which consisted of 12 tasks. The selection of tasks was performed by defining three tasks for each component of critical thinking, singled out by using operationalization (formulation of the problem, reformulation of the problem, evaluation and sensitivity to the problem). Within each component of critical thinking, each task referred to specific skills of that component of critical thinking. Each task was worth 5 points. The maximum number of points that could be scored on the test was 60 points.