- Get sleep. Pretty simply, but staying up 20 hours a day means you're barely able to focus on anything, much less a League game.
- Eat as healthy as you can. If you can afford to not eat garbage all day, you really should. Food you actually have to cook yourself is a step in the right direction.
- Get some form of exercise. I seriously mean this. It doesn't have to be working out at the gym for hours. Go on a 20 minute walk. Do some situps or push-ups. The best thing I can recommend for people who play League is to do situps and push-ups for every death in a game, and do them right after the game. It works wonders.
- If you don't feel like you are going to play your best: don't. On a side note: if you have ranked anxiety, I recommend the opposite: just play, get over your ladder anxiety.
- Be positive. This wins more games than I can count. Don't give up ever. If you truly want your elo to rise, stay positive, and never surrender: people love to throw games, especially at lower elo's.
- Along the same vain as positivity: never rage. It never get's anything done. Even if people rage at you, do not return rage. Just keep calm and farm on.
Next list will be in-game/in-queue tips.