A tip from my awesome General Studies teacher: the GS papers are written up to four years before the actual exam (bizarre, I know, but it's true - hence paper leakage scandals), so it might be a good idea to see what was current in the news between two and four years ago. Brainstorm those topics and possibly remember any interesting statistics you come across, as they strengthen any argument. Anecdotal evidence is perfectly fine too.
As for section B - as for any essay you do, prepare a plan before you start writing it, as it's possible to gain marks on organisation, and it shows the script marker where you were going to go with your answer, should you run out of time.