If you try these quizzes every month (or every other month) from now until your exams you should know the content really, really well. In the revision guide highlight your target grade in one colour, and every time you have completed a quiz (or a test in school) mark that on the table, so you can see how you are improving over time!

These are very rough grade boundaries based on last years exam results. getting a certain grade in these quizzes, does not mean you'll get that in the exam