Is a shortcoming in one's studies considered a sin if the average exceeds 90%, despite the parents considering it a shortcoming?

If one's average is good, no shortcoming appears from them. However, one should not be content with a rank from which a better one can be achieved, as the poet said: "If you compete for an esteemed honor, do not be content with anything less than the stars." And this does not reach the level of sin.