> When we learn something new, [...] We could overwork ourselves and not realize it. [...] It’s only when we show up for an exam [...] that we know if all that

> When we learn something new, [...] We could overwork ourselves and not realize it. [...] It’s only when we show up for an exam [...] that we know if all that practice actually worked. So that's why you have to shut the book and recite the study material.