For C1 AS level maths preparation, using the official Edexcel revision guide is highly recommended, as it contains worked examples and practice questions aligned with the exam syllabus. Completing past papers is emphasized as a key strategy for achieving high scores, with one participant noting a personal success of scoring 100 on C1 and C2 exams. There is discussion about the grading system, clarifying that Edexcel provides UMS scores, with an A awarded for 80% and an A* requiring an average of 90% across C3 and C4 modules. The conversation also touches on the availability of further Maths courses in Portsmouth, with one participant expressing a desire to enroll but struggling to find options. Comparisons between exam boards (AQA, Edexcel, OCR MEI) suggest minimal differences, primarily in specifications, although some believe MEI may be more challenging. Overall, the community emphasizes the importance of practice and resource utilization in achieving success in AS level maths.