ten times review

When I was in Shar Yashuv, I heard this idea about review ten times, and I am seeing that this helps. It was how I used to do the Maharsha and Pnei Yehoshua, and the other achronim like Rav Chaim of Brisk and Rav Shach. I have started to see that this idea help also for Mathematics. [I do not mean to diminish the importance of fast learning also- but I think the main emphasis ought to be on lots of review and in depth learning as my son Izhak told me