hare/hound races

do any categories other than A’s win these types of races?

Yes, I’ve ridden as a B and C and won.  It depends on the gap, they adjust it now and again.  For example if C hold off A by a couple of minutes they’ll get less of a start next time. Also it’s also down to riders on the day.  If A isn’t particularly strong or coordinated then they may not take it.

thx stuart guess ill give it another try in the future.

Look around as there are several variants. Cat & mouse is another.