How To Get High CTR In My Adsense

Today I got almost all my site with the small earning for example 5 clicks only $0.10, what a pity, so my total earning are $2.35 only from 22 clicks . It is less than my yesterday earning even though the number of clicks almost same. I still not understand how it it come small. Is the advertiser offering their small ads in my site or what happen exactly problem. It is different with my friend site, he has only 2 clicks but his earning is high or near with my earning, so How to make my CTR coming high? Do any reader know with my problems.

Generally I set up my Adsense display more than one including 3 Ad Unit and 3 Link Unit for the reason is to make my ads visible for my visitor with estimate getting more clicks from my visitor. I tried this way long time, even like that some time I got high paying clicks, but commonly small clicks paying. Must I have to change my Adsense set up or what to do. I wish any readers willing to help me so I can improve my Adsense Earning to be more.

Thank for you favor and kindly to help me