One of the best educational tips I got as a teen was to write down my math problems (things I didn't grasp) in the evening and read them after waking up in the

One of the best educational tips I got as a teen was to write down my math problems (things I didn't grasp) in the evening and read them after waking up in the weekend. Suddenly you're hit with a series of "aha"-moments and problems get solved in minutes. Tiredness has an enormous impact on your problem-solving skills.