I just do loads and loads of practice questions. For these things its usually specific words from the mark scheme but if ur teacher doesn't use it then I'm not too sure. But if u do enough questions hopefully the ones u do will turn up in the mock? Also just making sure ur good with the content that comes up and knowing ur stuff! I'm sure she'll mark less harshly for the mock though as she wants u to all do well for ur predicteds? Good luck!