Levelling Arcanist 11

Greater Arcane Exploit: Greater Metamagic Knowledge

Metamagic Feat: Enlarge Spell

Level 11 Feat: Greater Spell Penetration

New spells: Break Enchantment(5th), Cone of Cold (5th)

Skill points: +1 Swim, +1 Spellcraft, +1 Diplomacy, +1 K(Planes) +1 K(Religion), +3 K(History) +1 Fly

Done, you have one more skill point from your favoured class (or you can take +1 hp instead)