I would also like to add that the students gain a self-confidence that they never had before. A child’s self-worth and self-perception is really damaged when they experience failure after failure.
I have heard my son wonder why he is so “dumb”. And when I encouraged him to try again, he told me straight out “I just can’t do it! Nothing helps me!”. I can’t tell you what a boost it is for him when he comes home and tells me he reached a new level in his Arrowsmith exercises. He knows it is difficult and he is doing it!