Do all classwork and homework, be it for school or private tuitions.
Limit social media usage and gaming.
Revise well beforehand.
Practise past papers variant 1,2,3.
Mindmaps to recall points used widely in discussion topics.
Practise past papers on the last 10-year period and pay particular attention to the marking schemes.
Practise past papers on the last 10-year period at least and revise formats by heart as it'll help you attempt questions more quickly.
Interact with news platforms e.g. TheGuardian and, I personally looked up on the net for world and Mauritius-specific statistics to include in my essays.