SOS!!! especially for UCL students!!!?

i got an offer from ucl for german and management degree...however, i have to get ABB....so my question is....if i get lower grades will they still take me?? what is the lowest grade which i can get?? i think not many people want to do german so this is not a very competitive degree..i am asking it..because i have finished my exams and i don't feel very confident abut them...anyway my insurance is queen mary..do u think QM is also a good uni??