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PFS StandardSpell Mastery Feat 20

Wizard 
Source Player Core pg. 205

You have mastered a handful of spells to such a degree that you can cast them even if you haven’t prepared them in advance. Select any four spells of 9th rank or lower that are in your spellbook; each spell you select must be of a different rank. These spells are automatically prepared when you make your daily preparations, and you gain an extra spell slot for each spell. You can select a different combination of spells by spending 1 week of downtime studying your spellbook and retraining your mastered spells.