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    I've been doing some Biology practice papers but the grade boundaries only go up to A (obviously, as A*s aren't awarded until the end of A2). How do I calculate the A* equivalent and the raw marks needed for full UMS? I know about the distance between the grade boundary, double it, but does that differ because of hypothetical A*s? HELP PLEASE!

    For example,

    90/90 UMS = 60/60 raw marks
    A = 72 UMS = 46 raw marks
    B = 63 UMS = 41 raw marks

    How do I work out the A* equivalent and full UMS raw mark equivalent for that?

    This may not be 100% accurate but to get an A* I think you need 90% UMS so as an A would be 80% and the raw mark is 46 and a B would be 70% and the raw mark is 41 - an A* would be be 51 if the interval between each 10% is 5 - so if I written it in a confusing way! all the best!

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    What exam board is it?

    Have you seen AQA's UMS converter?

    If it's not AQA, sorry, can't help. Best you can do really is estimate as you've suggested.

    Half-way between 46 and 60 is 53 for 90%. But it could be any number between 47 and 60 depending on the results the exam board gets.

    e.g. if virtually no-one gets above 50, then 50 would get full (90) UMS marks.

    As above, probably best to assume equal spacing and so 56 would get full UMS.

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