I do believe that drilling is important, but fear that the 100% thing would diminish enthusiasm for learning and put my kids off mathematics. They need challenges in addition to the repetition. So we approach this by alternating topics: we'll learn something new during one session, and then spend the nexct couple days going over the stuff that needs repetition. This keeps my kids interested.
But I think I can use the experience to teach a lesson about learning how to take a test. This could be valuable.
Val
