I think generally they say around 80% of the raw marks will be an A. However this varies from year. UMS marks are the same every year so you need the same number of UMS marks to get an A every year but the amount of raw marks that is equivalent to those UMS marks varies based on the raw mark grade boundary which depends on the difficulty of individual exams and how people generally performed in that exam. Hope this makes sense!
EDIT: This means you may not need full marks to actually get 100% UMS if many people did badly in that exam - strange but true.
Last edited by Mero8; 13-04-2012 at 15:34.
UMS is just another way of giving you a score. Say for example, a paper is out of 80UMS, generally an A would be 64UMS (80%). It can also be seen as a measure to see how you compared to all the students who took the same paper.
Last edited by andrewpeters; 13-04-2012 at 16:33.