The Dedicated Focus feat (PG p.155) has you choose a school of magic. when you gain a spell from that school, you also learn a bonus spell from that school. The Mystic class allows you to swap out a spell when you level up (p. 108)
Can these combined mechanics be used to just swap spells later without school restrictions? should we be tracking the school specific spells and the bonus spells so they can only be swapped for spells of that chosen class? my concern is that this feat could be exploited, and that the school restriction could be overcome, effectively granting extra spells of any school.