I'm an 18 year old A level student who has a passion for Maths

To find the gaps in their knowledge, I'll ask them to sit a full GCSE Maths paper. Alternatively, if it's a student, they can tell me which topics they are struggling with. I'll then find resources and practice questions to initially work through together, explaining the process of the problem. After the student gains an understanding, they'll work through some questions that progressively get harder and they can feel free to ask any questions. Finally, I'll set them some independent questions to work on in their own time. The best way to perfect maths is through practicing as many questions as possible.