Thank you for the opportunity to help you with your question!
To improve yourself in mathematics you will need a lot of practice. For example repeating the exercises at the end of the topic the teacher has completed. complete 5 mathematical sums daily and see the difference for yourself.
Sciences require a lot of research and extensive reading. Or you can Studypool with a tutor
Please let me know if you need any clarification. I'm always happy to answer your questions.