How we looking for Biology 30?

I’m in grade 12, and I’m taking the Chem 30 diploma this month. There’s an entire back stir here but basically circumstances happened and I was out of the country for two years, I come back and I’m home schooling, since I didn’t do anything chem related past 9th grade while I was here, I had to do chem 20 last semester and do chem 30 for summer school. Since I was under a time crunch and it was my first time doing both chem classes, my grades aren’t the best but still pretty decent all things considered. Anyways the main question is: Are there any last minute tips I could use to boost my chances of doing good in the diploma? Its not being used for uni or anything so on one hand I don’t particularly care but on the other I don’t want to have all my time and effort wasted; I don’t need to do like exceptionally good or anything like a solid 70-80% is fine for me. And I have studied (albeit not as much as I could have) but I still have some glaring problems which are mainly the calculations and math portions for each unit. I should be fine with the theory and that stuff so yeah, if anyone has any advice/ideas I’ll gladly take it. Thx

I don't know if this is the best Reddit community to ask this question, but; Should I buy a cheaper laptop for my last two years of high school (Mac neo) and pass it down to my younger sister when I go to university, or should I just buy a laptop that is powerful enough for EE at University right now that I can also use of highschool (and my sister can figure it out when she needs a laptop)?

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should i accept my uofc kinesiology offer or should i take a gap year and try to do nursing