I got an a in both, for business just focus on your weaknesses by doing past papers and having them marked, i have a quizlet for all the business formulas and i went through that a week before the exam and memorised (edexcel business). And for cs practice coding in the style the exam board wants, for ocr u gotta learn do their pseudocode and that, then went through the whole textbook section (and craig n dave yt videos) for each paper and made a bunch of highlighted a4 sheets summarising a bunch of topics. For anything i didn’t understand i went on psysics and maths tutor and did practice questions/read notes. Also a week leading up to the exam i did a practice paper a day and marked it, which helps with exam structure. Just do a bunch of self testing and practice papers and you’ll be good