I am asking in general as UMS can change is 84% an A always as in past years have never exceeded this
Knowing exactly how much UMS you got in that exam is more useful than knowing roughly how many marks you need in each exam to get an A, in my opinion.
Also, adding the marks then doing it as a percentage isn't useful - with Edexcel for example, the grade boundaries are quite high for D1 so you're probably not going to get as much as 84% of 300, depending on what FP1 and M1 are like.
I don't know the answer to your question (if no one does, you can have a look at grade boundaries for all of the years and work it out for yourself) but I'm not sure how useful it is anyway.
Just do the best you can and worry about results later.
That's cunning. I was just estimating from the grade boundaries. I've done you out of a mark on FP1, it should be 227.
This was particularly high boundaries on FP1. I remember that my students who took this exam were very scared the day before the results, when we read the grade boundaries. In fact 7 out of the 9 got 90 UMS or more.