There should be a category to submit runs for each level.

From my experience, racing games like CTR don't usually have time trial runs; not typically in the business of "speedrunning".

This board isn't really the place for time trials/individual levels. ctr4ever has been the place for that for years and years and years. It's still a pretty active place, so check it out if you're interested in that sort of thing: http://ctr4ever.joora.fr/home.php