I'm looking for a patient math tutor to help my teenager with GCSE-level topics and some pre-exam practice. We need a weekly session, ideally 1 to 2 hours, focusing on algebra, geometry, and problem-solving strategies. The lessons should be conducted in English, preferably online but in-person in London would also work. Comfort with GCSE syllabus and practice papers is important, and please include a quick progress check at the end of each session. Availability on weekday evenings or Saturday mornings would be ideal.