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    So I'm currently doing my biology and physics ISA. If I happened to not do so well in an ISA, how hard would it be to get an A* overall?
    Say I got a B in all my ISAs, how many marks would I probably need to get on unit1,2 and 3 of each science to get an A* in each?
    I'm aiming for straight A*s so...
    I think my ISAs are going pretty well though and I've probably got A*s/ A's but I'm a bit of an overthinker so I need reassurance.

    The ISA is 25% of the GCSE. Therefore, it is worth 100 UMS out of 400 UMS. A B would be 70+ UMS and you need 360/400 UMS to get an A* overall.
    So you would need 290 UMS across three exams (That have a potential of 300 UMS overall). So you would need 97 UMS (A high A*) out of 100 on each exam. Though this number would fall if you got a high B or if you got an A/A*.

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