Anybody here can tell me how the SEO Google is working? I heard SEO from Google also can making a money.

A very easy question but a very tough answer !
No body knows till now, how a Page Rank is given to site. When some one makes a conclusion of "This is how the PR is calculated..." immediately the Google team updates its algorithm.

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We can predict to some extent, but not to the full clearance. I think Google tracks the traffic for our site and suggest the PR of our site and so it goes on. May be more process would be hidden behind their formula and still unpredictable.