A necessary and sufficient condition for a student to have perfect performance on a calculus exam is to correctly, perfectly clearly and with perfect elegance answer every question within the time allotted. But what if the student also includes her proof of the Riemann Zeta Conjecture on the last page? Hasn't the student done better than perfect?
Well, the student hasn't done something more perfect. But the student has taken her answers above and beyond the nature of a calculus exam. So, yes, while one cannot be more than perfect, one can go above nature. Perfection is not the same as maximality of value.