Since we're sharing tips, an arena tip that I learned from earlier in this thread...
Tap the corner of the refresh button at least 12 times without activating it. Move towards the button while tapping until you press it. Do it right and your opponent's arena points will be visible. Always challenge leaders with close to 3000 points more than you. Do this and you should either get 200 points if you win, but if you lose, you'll only lose 10. That way, you'll always go up in arena points.
Another variation on the tapping is to tap a dozen times on a cloud and then hit the refresh button.
Tap the corner of the refresh button at least 12 times without activating it. Move towards the button while tapping until you press it. Do it right and your opponent's arena points will be visible. Always challenge leaders with close to 3000 points more than you. Do this and you should either get 200 points if you win, but if you lose, you'll only lose 10. That way, you'll always go up in arena points.
Another variation on the tapping is to tap a dozen times on a cloud and then hit the refresh button.