At present, doing link exchanging with other relevant websites can nearly be having a zero effect on increasing the
PR of websites and the only way to increase
PR could be using one way links from top resources and higher
PR sites. Even after adding several of such links, you need to wait and remain patient for some weeks and months because unlike the rankings data and information, the
PR statistics on Google are not updated that quickly and it needs time to notice the positive effects of the recently added links on your website.