Nottingham Prelim entry requirements for degree students is:
At least 2:1 in a non animal-, biology- or chemistry-related subject with supporting A level qualifications of BB (to include, at most, only one of biology and chemistry and excluding citizenship studies, critical thinking, general studies and global perspectives) and GCSE Grade B (6) in English language and maths.
Remember though graduate entry costs are large with no tuition fee loan from the government. If you dropped out now though, I don't think your grades as they are will be strong enough for their Prelim course as they ask for AAB for non-graduates