high school or university maths from MAT marker of Oxford

Bachelor's degree in mathematics. Master's degree in theoretical computer science. I used to mark MAT papers of Oxford maths&statistics&cs applicants. Have tutoring experience in both high school maths and university-level calculus, algebra and logic. Can go through not only how to solve exam questions, but also the knowledge scope beyond it. Also interested in maths history and the chronological development. Can offer online courses. (something wrong with the lesson form while I cannot edit, I offer lessons online mainly, but if you are in London in-person is also possible).