DD did this and we were fortunate enough that the classes were actually taught @ our High School by College certifide teachers....she did this and fully participated in her High School activities....the plus side was that between her AP classes , Honors classes , and Post secondary classes she was able to start college with enough credits that by the time she started her second semester on Jan 5 she is a sophomore according to her transcripts. The down side is her college coach has expressed concern that she be able to maintain a fulltime schedule for 4 years to keep her eligible to play... Good problem to have,LOL She is looking into an logical Minor to take in addition to her Major...premed ....that will help her achieve her ultimate goal...