Arcanist School Savant Archetypes and Wood, Void, Metal schools.

[Kerney]

How do these work in the Archetype. I'm looking to do a wood school savant and am wondering whether I need 1 or 2 opposed schools. Since this is a pfs character I'm looking for something offical.

[Casual Viking]

The requirement to select two opposition schools are created by the School Focus class feature.

The ability to select only a single opposition school is part of the introduction to Elemental Arcane Schools in UM and APG (not part of the Arcane School class feature as d20pfsrd implies). You are not specializing in a School "as a Wizard, but"; you get specific abilities and restrictions from the Arcanist class.

RAW, the exemptions don't apply to you. Two opposition schools.