How you improve PR fast?
 

There are few technique below.
1) Conduct a brief review of each site on your list.

2) Focus on the positive and say nice things about their strong points.

3) Set up an award page on your site and post each review for all to see.

4) Contact each of the sites, present them with their award and give them the URL where you have posted your nice review.

5) Sit back and watch as many of them post a link to your site, (in order to share your positive testimonial with their visitors).

The key here is to refrain from going overboard with excessive hyperbole. People can tell the difference between an honest review and blatant spam, so do yourself a favor and try to keep it real.

Finally, this is just one possible example of the type of creative strategy that can be employed to increase quality backlinks. Needless to say, there are many others, so feel free to use your imagination