Leon’s psychology instructor has scheduled an exam every third week of the term. leon will probably study the most just before an exam and the least just after an exam. this is because the schedule of exams is reinforcing studying according to which schedule?

Fixed-interval

Explanation:

A fixed interval schedule is a term that refers to a type of "reward" when an activity is performed over a certain period of time. In the case given in the question, Leon organizes his studies based on interval programming, where he studies long before the test, but "rewards" himself after the test by studying less after the test.