Thank you for your reply.
Yeah I have tried that and it worked well. I had it setup so that each score was either a pass or a fail and the category total was an aggregation taking the lowest score (ie if failed or not completed one section - failed the standard). However I soon realised the pass or fail mark for each section was being calculated by the global course pass mark not the individual section 'Grade to pass' setting. The grade to pass setting seems to only have an effect on the colour displayed behind the score. This would result in a score saying pass but with red behind it indicating a fail
I also tried to make a custom grade calculation but to no avail. I tried to put each mark to the power of zero (giving 1) and then multiply them together. This would give an aggregate of 1 if they had passed all and zero if they had failed any. I couldn't work out how to plug in the parameters to the power function. Im also not sure what it would do to a blank score which should be a fail.