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Raw marks and weighted marks

My A Levels were taken with the CIE board, big mistake, they're really unhelpful!

I'm hoping someone here can help.

Basically at the moment, i'm trying to get my exam centre to give me my component marks, which is proving rather difficult so i'm trying to figure some of it out on my own.

Let's take Psychology for an example, I received 68%

Paper 1 is worth 80 raw marks (50 weighted marks) = weighing factor 0.625
Paper 2 is worth 70 raw marks (50 weighted marks)= weighing factor 0.71429
Paper 3 is worth 80 raw marks (100 weighted marks) =weighing factor 1.25

So the total raw mark would be 230 but an A Level has a total weight of 200.

I'm trying to work out how many raw marks I have in total

I thought I could just find 68% of 200 but obviously not because that would give 136, which isn't possible because that would put me in the boundary of an A (135) and I only got a C (very nearly a B)

Link to grade threshold: http://www.cambridgeinternational.org/Images/500607-psychology-9698-june-2018.pdf

If anyone can help, in what seems to be some very confused math problem, it would be greatly appreciated!!
You can't do it unless you know your percentage in each unit.

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