I've been tutoring GCSE Science students for over 5 years now. I use the guideline of the students exam boards to plan the topics to study as well as the CGP books for the exam board. Once you gain a good understanding of a unit you'll answer questions from that unit and do past paper questions. This, I found allows the student to be ready for exams, by continuously and always practising exam style questions. Im always keen to teach the student in whatever topic they feel they need more understanding in and in the areas they find they are weaker to help strengthen it. I'm a teacher thats alway available for her students and ready to help.