User blog comment:TheSonofNeptune/Is Percy Jackson going to have to repeat a grade in Highschool?/@comment-4890664-20130212085836

In all fairness I think that Hear being a all powerful goddess can manipulate the mist to wher no one really misses Percy in the mortal world

Plus he was going on winter break early so he missed only like 4-5 months of school including spring break.