anonymous is right - no point learning things a few days before the exam. Just get used to the style of questions and practise doing them. Also, if you are in edexcel (not sure if this applies to other boards) they have the 6 mark quality or written communication questions. (they ask you to briefly evaluate something). You could get some practice for that.
Likely topics for the QWC questions -
Uses of limestone
Alternative methods of extracting coppers
Impact of burning hydrocarbons
Disposal of plastics
Just familiarise yourself with these topics - hope this helped!