We normally used to get the odd person with full UMS in a Biology or Chemistry exam - of course that probably wasn't anywhere near full marks - for an A* in OCR Biology last year you needed 178/270 raw marks , nowhere near the 90% of UMS required, so, had this been a qualification with UMS, you'd have achieved it with a lot less than 270 raw marks.
We normally used to get the odd person with full UMS in a Biology or Chemistry exam - of course that probably wasn't anywhere near full marks - for an A* in OCR Biology last year you needed 178/270 raw marks , nowhere near the 90% of UMS required, so, had this been a qualification with UMS, you'd have achieved it with a lot less than 270 raw marks.
Thank you for the interesting response, this information is helpful!