I'm always losing when I get level 13

I mostly use katarina and i level up faster and I kill more than my team but I feel they are noobs! Any suggestions how should I do to level up faster to 30?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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