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Chemistry Gas, moles, calculations

Hi everyone,

Sorry has anyone or is anyone taking the evaluative AS Chemistry practical on gas volumes and calculations? It's not necessarily a practical as we wouldn't be doing any practicals but questions would be asked and I'm not sure how to prepare for it. I would love to get full marks in this ISA as my previous Isa's went horrible and it my school- they only gave us once chance to do well in it. Everyone else had many chances, my friends from other schools had three and we had one for each.
I can't be bothered anymore, I'm done complaining. Just wanted tips and advice for this evaluative practical. Anything, any input would be great. Thank you.