As many of us become aware one way or another spell schools are completely arbitrary. Same spell can be assigned different schools with very little effort. Yet I like the school system and I think with few changes it becomes workable.
I know agreeing on a school for every spell is hard to impossible so I am asking for your house rules on the subject.
Worst offenders I see are conjuration(healing) spells, necromancy should be school of both positive and negative energy so it should include these spells. Mage armor should be in abjuration. Ki arrow is clearly evocation. And these are from first level.