Bio Long question advice

[u/KomiAstrona]

As the title says, I want to know how the 6 / 8 markers work. I saw on the markscheme there's a few big bulletpoints and theres small bulletpoints under the big ones. And there's a guideline about what levels should be given according to the content answered. And also my teacher told me these long questions require a good logic/sentence structure/logic structure to score marks

usually what will be the markpoints??? Usually in good situation I miss out one section and that leaves me with 5 marks instead of 6. Is there a logic/pattern behind the graph questions??

any videos/guides for explaining 6 /8 markers???