If you want to improve, then practice.
Please find below papers from previous years of maths challenges that you can use to help you improve.
Papers from previous years:
If you do well in the junior maths challenge, you may qualify for the Kangaroo Round or the Junior Mathematical Olympiad. Click on the names to find questions from previous years to help you practice.
Papers from previous years:
If you do well in the intermediate maths challenge, you may qualify for the Grey Kangaroo Round or the Cayley Olympiad. Click on the names to find questions from previous years to help you practice.
Papers from previous years:
If you do well in the Senior Maths Challenge, you may qualify for the Kangaroo Round or the British Maths Olympiad (BMO). BMO questions have amazing video solutions if you click here.