The following is taken from the Undergraduate Course Handbook 2007-2008.
The Examiners are responsible for the detailed weightings of papers and projects. The precise details of how the final mark is calculated will be published in the examination conventions produced by the Examiners.
After Part B of the BA or Part C of the MPhys, candidates will be ranked on the basis of a total mark that is obtained by adding the scaled marks of individual elements multiplied by the following weightings:
(The Examination Conventions for 2008-09 give the total marks available for Exams, Short Options, Practicals and Projects)