I just wanted to comment, having been in the same calculus class as Natsu, that the focus was very much on getting the right answer and doing it the "right way." I grew up going to a Montessori school that in some ways was very similar to Natsu's cram school, much more focused on the process and the learning as opposed to the end product. Even after 10 1/2 years in "normal school" I still sometimes miss that chance to be creative and explore learning instead of trying to get the right answer (or the best grades, or the top score). I often feel I learned much better back when the attention was put on how you got there instead of where you were going.