school of spell-Duplicating spells?

[With a box]

if I have spell focus(evocation) and cast miracle for duplicate Mass Hold Person(enchentment) then save DC of it rasie by spell focus?
how about Shadow Conjuration?

[Janthkin]

Shadow Conjuration is an Illusion, regardless of which spell it mimics (hence all the rules about disbelieving & partial effects). You never cast the mimicked spell.

Miracle "duplicate(s) any cleric spell...". Given that Wish allows you to duplicate spells that aren't of a school prohibited to you, I'm guessing Wish/Miracle actually DO cast the duplicated spell, original school and all. So you'd need Spell Focus (Enchantment) to boost a (Mass) Hold Person.