Thread:DQueenie13/@comment-27218075-20161110032742/@comment-918376-20161110075635

Just double-checked the info (from the Japanese wiki). As an Apprentice, you can only learn low-level skills (up to level 25) from a maximum of four different subclasses.

Say there's an Apprentice who mentored under a Tailor and a Chef. If they decide to switch from an Apprentice to a Chef, they keep the skills and levels they acquired as a Chef, but they'll lose whatever Tailor skills they learned.