My son's school does not do class rank. PERIOD! But it has an option to place class percentile on the transcript or not. I know that if you do not report your percentile that USNA will extrapolate it from the student's ACT scores. My son is in the top 13th percentile. With a Math ACT score of 33 and English ACT of 34. I do not know the mathematical formula. Therefore would it be better to place the top 13th percentile or would it be better to leave that blank and let them extrapolate it from the Act scores?