hi i have tested a lot of seo but my site http://www.spacenepal.com not haveing good page ranked so please if you have some idea to increase please help thanks
http://www.google.com/search?hl=en&q=site:www.spacenepal.com - You have 4,000+ pages indexed. http://www.google.com/search?hl=en&q=link:www.spacenepal.com - You have one mature backlink according to Google. You need to start working on your backlinks, get some quality one-way backlinks from relevant sites, use the same anchor text as the keyword\phrases you are trying to rank for.
How old is your site. In order to have PR you have to gather more links. And why are you bothering yourself about PR? I think you should concentrate more on improving your SERP than bothering yourself with PR.
Its not the search engine its your site. As what they are always saying build more quality links for a better PR