A Level students often apply to universities before they have taken their final exams, with applications administered centrally through UCAS . British universities (including Scottish universities, which receive many applicants taking A Levels) consider GCSEs, AS-level results, predicted A Level results, and extracurricular accomplishments when deciding whether applicants should be made an offer through UCAS. These offers may be 'unconditional', guaranteeing a place regardless of performance in A2 examinations. Far more often, the offers are conditional on A level grades, and become void should the student fail to achieve the marks expected by the university (for example, conditional offer of three A Levels at grades B-B-C).  Universities may specify which subjects they wish these grades to be in (for example, conditional offer of grades A-A-B with a grade A in Mathematics).  The offer may include additional requirements, such as attaining a particular grade in the Sixth Term Examination Paper . The university is obliged to accept the candidate if the conditions are met, but is not obliged to reject a candidate who misses the requirements. Leniency may in particular be shown if the candidate narrowly misses grades.
There is quite a lot of work in each GCSE so it's always advisable to plan for that and make sure you can cope with the workload. In the vast majority ofschools GCSE Maths, English Language and Science are compulsory and the other subjects you will be entered for will be options that you choose from a range offered by the school (in some establishments a language is also compulsory and in others, Religious Studies too). All in all it's worth taking a lot of time in Yr 9 identifying those which you have to take, and then finding out as much as you can about the others before choosing your options.