please help

I already feel guilty and currently bawling while typing this but I haven't done anything for maths. i did few chapters in August June July which I've almost forgotten now and I can vent more but it won't solve shit for me. so if u can help me out here, I would really really really appreciate it. i need help from someone to tell me what chapter I can do now easily so I score at least 20 marks in maths, yes my physics and chemistry are strong.