How to increase Adsense cpc and ctr?

How to increase Adsense cpc and ctr? Some times we receive cpc of $0.01 and less ctr. Do you know how to increase cpc and ctr. If we get $1-$5 cpc on every click then we can acheive $10-$20 per day easily on very less traffic. But if we get $0.01 cpc, adsense is may not give desired result in earning.
What is your thought on this?