It's common sence for most people, but I 'discovered' it last week.
To get higher rating with your arena team, play the night before maintenance day. THat would be mondays in the US, and tuesdays in EU.
"Why?", you might ask. That's when people who "only wants to play 10 games for points" play. Now, this only works for teams under ~1700 rating.
Just a tip