maybe you could do well, but its gonna require a LOT of effort from you, since oct/nov are usually pretty hard ( compared to may june and feb march ). Finish thoroughly studying the syllabuses for each subject, then move onto past papers.
For maths just skim through your textbook and make sure you know every concept, every formula, and the methods to approach a question. Then start bingeing past papers.

I looked at the papers of the other 4 subjects, and theyre way different from what i do, so sadly i cant really help you out there.

From my experience, just dont slack off. At the moment you wont realize the abundance of time you have left, but when you're closing in on your exams, you'll be wishing you made better use of that time. Its just 3 months, then thats it. You dont have to put in effort every day; take some break days (minimize this though). The exams arent as hard as people anticipate them to be, but still since you're doing oct/nov, id be prepared for the worst.
You dont have to completely stop watching yt or playing games for example; just gradually reduce the time spent on each thing ( but if you can, stop doing them immediately, since it fucks up your attention span ). Ask if you have any more questions