How do I pass an ISA in GCSE science

I have already failed two and another one is coming up soon can you help me?

How did you fail the first two? Were you given reasons?
29 November 2011
I failed the first one because of the written exam, I passed the practical so I am okay with that, and no I wasnt given any reasons I have a feeling its because I just have a lack of understanding with everything involving the written exam.
30 November 2011
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