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GCSE Edexcel Biology Controlled Assessment Tips???

So my experiment was to examine how the duration of exercise affects heart rate. My group did star jumps using a metronome for 30 seconds, 60 seconds, 90 seconds etc up to 3 mins. The graph is plotted and my results support my hypothesis. My teacher is marking it was we go and so far I've only lost two marks.

I was wondering if anyone had any tips for maximising my marks in the rest of the controlled assessment (comment on secondary evidence, conclusion, evaluation of conclusion, strengths and weaknesses/evaluation of method etc). I'm looking for the highest mark possible and would appreciate any tips on what to write, how to
write etc

Thanks :smile: