In the past, many GCSE qualifications used a modular system, where some assessment (up to 60% under the 'terminal rule') could be submitted prior to the final examination series. This allowed for students to take some units of a GCSE before the final examination series, and thus gave indication of progress and ability at various stages, as well as allowing for students to resit exams in which they did not score as highly, in order to boost their grade, before receiving the qualification.