Here is the way hjow u can increase ur adsense amount,

I wonder really if these high paying keywords work now. Maybe before. Either they are for very esoteric subjects that nobody is interested or uber popular that thousands of sites use them. There are so many websites that use these so called high paying keywords that you can't really drive traffic to yours using these keywords because you are competing with a lot of websites which have these high paying keywords and are more popular than yours. There is little chance of being found. People are saying now that you can earn the same amount of money with low paying keywords because there is less competition and your site will rank better for that particular word. But the best paying strategy in my experieince, is still to build your website on a subject that you know and are passionate about. You build a good readership, and good sites will link to you ... and slowly your earnings increase. And because your site is constantly being built and updated, bots which crawl your site will find something new and will rank you higher.

Pls tell me where in blog we need to add these keywords? One person told me to add it to header but there is no such option in blogspot.com