>> i want to submit a site, how do i know how many editors are there in the category <<
Since there are hundreds of editors who can edit in each and every category, pay no attention as to whether there is a listed editorname at the bottom of the page or not. The submission guidelines say to pick the category by subject. It says nothing about listed editors, or last edited date; because those things have zero effect on the future.
>> also i want to know how to find whether my site is rejected, so that i can improvise and resubmit again. <<
We no longer give status checks, so, no, there is no way to find out whether a site was rejected, when, or by who. The only thing we make available is the list of accepted sites, sorted by category. Everything else is a distraction from that work.
As for quality of site it sounds like you want to do the bare minimum amount of work to get a listing. Why not try another method? Aim to make your site the best site of its type, far surpassing everything else on the web.
Guess what would happen then?
Editors would be falling over themselves to get the site listed, whether or not anyone had ever suggested it.