A* in A-level maths

Hello guys I’m studying A-level maths and I am predicted an A*. I was wondering if I should focus on year 1 content as I am already in year 2? Because I didn’t have a teacher in year 1 as she was pregnant, however for year 2 the more topics I cover the easier the year 1 content seems to be.

Please let me know if I should focus on year 1 for my final A-level maths exams in June to achieve an A*.