In the U.K., the General Certificate of Secondary Education (GCSE) qualification is used by universities in their admissions process, and they are often evaluated on a job application. Strong A* -- C results in a core subject such as Maths are vital for getting off to the best start in your career.
Acquire a list of kinds of questions you should expect on the Maths GCSE. Some schools give this information to all students, while some schools allow teachers to provide the information to students who request it. Others do not provide the information at all. In this case, purchase a revision guide. Make sure you know which exam boards you are sitting. The guide will contain a list of all possible topics from your exam board.
Produce a revision schedule. Set aside a few hours a week to devote to ensuring you know how to answer each type of question. Remember to allow time for breaks.
Produce high quality notes in class. Make sure you write down everything you need to know about the topic being studies. Your notes will be valuable later and should prompt you into remembering how to tackle a certain type of question. If your notes are not tidy, allocate time each day to type them up or rewrite them.
Revise each topic after you learn it. Read through your notes and practice questions. Mark yourself accurately or ask somebody else to mark you. Practice more questions throughout the week after learning the topic.
Ask your teacher for help with any topics you do not understand. Many schools run after-school lessons that will help you with one-to-one tutoring if necessary.
Purchase some practice papers from bookstores, or inquire at your school for these papers. Time yourself and answer all the questions as you would in the exam. Mark your paper, or ask a friend or family member to do this. This will not only highlight areas you need to study, but practice also prepares you to be more relaxed during the exam.
Do not revise the day before the exam. Have a day off to relax and make yourself feel refreshed. Read through any essential notes before entering the examination hall, and remain calm throughout the exam.