This sounds like something I would've made 9 months ago, memories.
Few things, while I know this song is a couple months old, but there's quite a few things you're missing with dubstep. First, dubstep is normally a kick and snare. I only heard a kick and clap. Second, the song lacked any variation. Maybe using the same melody would pass if this was trance, but not for a genre that needs variety. Third, I don't know what that drum pattern was at 0:44, but it seemed pretty random for any kind of song. At least you tried giving it energy. Fourth, try to not use the default drums. I can hook you up with some free drum samples for variation. Overall it's missing a drop. Even a basic wobble would've been nice.
Finally, I can tell you're trying to improve, but there's a lot you need to improve on. I have a faith in you, don't give up.

Gr8 job!