Using a schedule that alternates material you study is known as circuit learning
power pegging
rote memorizing
sensory visualizing

Circuit Learning

Explanation:

The point of circuit learning is for when you have many things to study, but little time to do so. So, the method is to determine which are most important and alternate.

i think the best answer would be d allowing 30 seconds between response would give time for what was already said to sink down in your mind.