– There’s an initial phase we can call “warming up”. Going back to the example of the athlete, you know that you always need to do some warming up before any sort of physical exercise. In a student’s case, you have to do mental exercises, and your mind needs time to prepare. This is the right time to do all of the tasks with medium difficulty.

– Then, there’s the maximum performance phase. The mind is ready, and we haven’t worked enough to be tired. This is the best time to get at those more difficult and/or less attractive tasks.

– In the final phase, both work rhythm and concentration decrease. We start to feel tired, and so it’s time to do the easiest tasks that require less effort and concentration.