The odds are definitely against you, but thats in no way saying it's not possible. Can't comment on the unis themselves, but people get contracts at MC firms from lower ranked unis. Most important thing is to network well, really focus on grades and work hard. Obviously its easy to say that and a different thing to do it, but it's no reason to give up! You may not aquire a TC first time round, and if you don't there's always the option to do an LLM at a more prestigious uni if you do well at undergrad. Good luck!