These are essentially the skills that make up their IQ, ability to pay attention, and capacity to learn, think, read and perform in school, on the sports field, AND in life.
Over 80% of learning struggles are caused by one or more weak cognitive skills. Suppose your child is frustrated and you are regularly switching curricula just to find something to which he or she will respond. Why not uncover the likely underlying cause and learn how to fix it (train it) rather than simply accommodating it year after year?