IGCSE Speaking and Listening?

I have to prepare for my Speaking and Listening, cambridge IGCSE. It would be great if someone could please notify me on how to gain full/high marks and help me choose a subject.
I have a few possible topic choices:
Careers- I have tons of information but it's very factual.
Money inside football (prices, wages ect.)- I can create a debate around facts and be very opinionated.
Mental Illness- A relative suffers from mental illness, I could discuss facts, experiences, and personal opinions.
Conspiracy theory of 9/11- I could create debate from facts and argue points.
My football club and town- History, passion, factual based again.
Sociology- I can argue and explore ideas such as education system or the media and create a debate and be very opinionated, as I am very knowledgeable in sociology.
Is there any advice on which topic to choose, and how to prepare to get high marks.
Any help is greatly appreciated. Thanks!