Try reading books and learning more advanced math concepts as well study the types of maths topics the questions you struggle have so you can differentiate from your strengths to focus on your weakness, try understanding the topics and ask your tutor or teacher if you can for help on how to solve these questions as well as doing online mock tests that are multiple choice. By this you will know what to work on without confusing yourself as the questions in the tests are from a variety of topics.
Hope this helped
