Though I only did so in my teens and found them effective, I have been using them on my boys, especially M.
When I was in Primary school, no one taught me how to learn. Adults, including teachers, used to just bark at kids to learn and revise. But how? That was never explained or clarified. I remember feeling baffled and all I did then was read my textbooks a million times.
Now, I am adamant to be more constructive and effective with my boys.