Remember the mocks?
Your mock exams served two huge purposes. One, as a dress rehearsal for the real thing. Two, for you to learn from your mistakes and fill in the gaps in your knowledge.
Have you filed the mock papers away? Why?? Use them to see what you need to learn. Some teachers provide a RAG analysis to help guide your revision, but if not then look at where you scored less than full marks on a question and see what the topic is called. There are lots of resources online, but I would also recommend the CGP revision workbooks which break the syllabus down in to topics and grades.
Focusing on what you don’t know or what you need to practice, will help you close the gap on the next grade up.