Fees in Dover:
http://www.dovercourt.edu.sg/index.php? ... Itemid=162
As for the chances it is always done base on individual merits so very difficult even to speculate based on your input so far. As I mentioned you have some strong points. Another strong point would be to get P1 EP (salaries above 8k). I understand that he is your only child. As beppi mentioned it will probably take you a few years to get the PR status. Yet another thing to realize is that PR is by definition for the people who want to settle down in Singapore so you should have the intention to put your roots to the local ground.