hi guys, i would like to ask how do i calculate UMS marks?

like for example, edexcel 2011 Jan Chemistry paper5 (out of 90):

A* 72

A 65

B 58

C 51

D 44

E 38

N 32

if i get 75 raw marks, what UMS do i get? how about if i get 80 raw marks?

because i saw on student room, that "you don't need to get full marks of the raw paper marks to get full UMS" i was just curious on that.

(and that's just a random figure, i know not many ppl get that but i'll set those as my target :] )