Tuition and books for grade 6 is php 50,000, plus uniforms and class and PE shoes. Note: Not complaining, just sharing information what a private school can cost in Dumaguete
Don Bosco is no exception, our daughter went to Foundation and both them and Silliman charge very similar amounts. We just enrolled her for university in Cebu and paid around 46k for one semester. Admittedly there might be cheaper courses than the one she picked. Once you get to the college/university cycle though, count on yearly expenses of around 350k if they go study outside Dumaguete and need a place in a dorm, money for food etc.