>>96004472
It depends on how advanced they are, their personality and how they do magic.
Some spend their early Magehood as Appantices in specific schooling, most Hermetics, and continue their studies in chantries and specific Horizon Realms.
Others have personal teachers and continue their normal lives through their life.

But the biggest fact about Mage is that at their core, their own Avatar will push them to advance.