Perhaps the most important discoveries are those which relate to the appropriate distribution of the periods of study...Acts of revision should be spaced in gradually increasing intervals, roughly intervals of one day, two days, four days, eight days, and so on.
Our brain forgets quickly newly learned information. Spaced repetitions are the most effective approach to internalize.
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The speed of forgetting depends on a number of factors such as the difficulty of the learned material (e.g. how meaningful it is), its representation and physiological factors such as stress and sleep. Furthermore higher original learning also reduces forgetting. The rate differs little between individuals.
No one ever said learning was to be easy, but it's part of the process of evolving as a human being, and we all have to go through it. When I look back, I see that each difficult time brought an important lesson. And I prefer to look at it with gratitude because I wouldn't be who I am today if I haven't gone through it all.