Prerequisite courses provide the information necessary to take following courses. If a student takes an exam for a prerequisite course and a subsequent course within the same exam session and passes both exams, both grades are upheld. If, however, in taking exams for a prerequisite and a subsequent course in the same exam session, a student does not pass the exam for the prerequisite course, any passing grade for the subsequent course will be annulled be a Rector's Decree as the prerequisite was not met.