Do you want to study maths? In the most competitive and arguably the best place in the country to do so? If yes, go for it.
Do you *want* to work ALL the time? If yes...you won't be in the majority.
I don't know anything about nightlife. I'm in bed by 9pm after working for 13 hours every day. :P (Real answer: there is a nightlife, but it's not exactly London. You make friends and have fun with them, in whatever way most suits you. Clubbing happens. Apparently.)
Lol, yeah. I'm in a mood because I got into this fight with a door last night which I still haven't completely recovered from . Lol, these are the type of people who come to Cambridge, a bunch of sarcastic maths geek haters plus an idiot who picks fights with doors.....run as far as you can Phil!!