SimTown Elementary is a school for Preteen Sims to go to at any time of the day. It is unlocked once the Preparing For Preteens quest has been completed.
GeneralPre-teens can only earn pocket money (Simoleons) by going to school. Their leveling system works with grades. Students attend school for 7 hours for levels 1-6 and 5 hours for levels 7 and 8.
Building SimTown Elementary also unlocks the Teacher career for adults. If you're a Level 1-3 Teacher, then you teach for 7 hours. But if your Sim is level 4 or 5, then you teach for 5 hours.