I have discovered these myself. Ignore it if you've already known.
To improve page ranking (
PR) on Google, in just a few days. You'll need to have 2 things
1.Good site content
2.Incoming links from sites with high Page Ranking.
For the first, you need to DIY. When you build up a website. You may already know the purpose of your site. You may need lots of work to improve its content.
To have incoming links, just insert the link to your site in your signature, in all forums and community that you're taking part in. Most of sites have Google Ad on it (include this site).
That's all I want to let you know.