Mathematics is a core subject across your younger years in education, to excel in such subject you will excel in various other subjects due to the passive skills you will pick up from it. You will learn how to understand the concepts of maths you come across in your syllabus rather than to memorise textbook definitions and be able to conceptualise what a question is asking you in the exam hall. I achieved a grade 9 in math GCSE, I achieved a grade A in math A level in year 12, Currently studying Physics, Computer Science, Further Maths in year 13.