Right-o! This post will address marks/grades and UMS.
Marks/Grades
Your AS grades count for 50% of your total A Level grade. The same holds true for your A2 grades. For the science subjects (and maybe most other subjects), you will be graded out of 600 UMS marks. UMS marks are the marks you obtain AFTER your paper has been marked. Your raw score is converted to a corresponding UMS score. Your grade depends on what UMS score you get.
You will always need the follow percentage UMS scores to get the matching grade:
80% - A
70% - B
60% - C
50% - D
40% - E
