Needs review
Source: Pathfinder: Advanced Class Guide

Description: You possess an impressive flexibility with casting that other wizards lack.

Prerequisites: Spell Mastery, Flexible Wizardry, 8th Level Prepared Arcane Caster

When you use Flexible Wizardry, you can flexibly prepare a number of spell slots equal to your Intelligence modifier + 4. Furthermore, you can finalize one of these slots with a standard action instead of a full-round action.