Sign up to a distance-learning GCSE math course. The course will follow the same curriculum as if you were taking regular classes at school. You will study graphs, geometry, equations and formulae as part of the course. Most online GCSE courses allocate a personal tutor who is available to help either online or by telephone. The course will provide and mark test papers.
Use text books specifically aimed at GCSE math, such as "Higher Mathematics for AQA GCSE." Work through the whole book, including the examples and then buy a revision guide for GCSE math.
Use online courses and videos that go through specific GCSE math examples. These websites often provide forums so you can interact with other math students and review past papers.
Pay for a face-to-face math tutor for hour-long sessions. Tutoring websites list local tutors or you could ask for a math student at a local college or university to tutor you. Make the most of this tutoring time to go through topics and questions that confuse you.
Enlist the help of an online tutor for your GCSE math studies. You will need a computer with broadband access and a microphone and web cam. Online tutors work all over the world so make sure your tutor understands the GCSE math curriculum well.