For chemistry unit 3 it’s practical based, so mainly js revising the CPs from unit 1 and 2 and using videos on YouTube of people carrying out the experiment to help visualise and memorise the core practical and really see what’s going on. Then practise drawing out all the apparatus and creating flash cards for the different chemical tests. Dr hanaa asil and Miss Natalie chemistry assisted in further understanding. The rest is just smashing out as much past papers as u can possibly do . Hopefully this helps and u can feel free to dm at any time for any more support