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OK. Basically, just follow Finland around all the time. Flirt with him when you can, and all that stuff lol. When you get invited to the party keep hanging out with him and you should be able to go to the party. 

In Finland's route, if you go to the party, there is the option to get into a fight.

No, he's a teacher and the PC is a student. I can't imagine them adding that route

Yes! I think someone left a comment explaining how to get her route in detail lower in the comments.