I have found in learning Tosphot and Mathematics that often there is a kind of way of learning that is a bit difficult to explain. That is to say I would learn Tosphot one day and by repeating it that same day even many times would not help to understand it at all. But if I would just go through it word by word, and then the next day do the same thing again, and then the next day do that again, then after some time it would become clear. It is like at night when sleeping somehow the subject would become clear on some deeper level. But then if the next day I would just go on, then it gets forgotten. So that is why there is this need to repeat the same tosphot day after day