This report investigates the progression of students from GCSE to A level in the same (or related) subject. That is, for a range of subjects, the proportion of GCSE students who continue to study the subject at A level is calculated. To understand possible sources of variation progression rates are broken down by GCSE grade and student gender. Finally, the report considers relationships between GCSE and A level grades for those students who do progress. To evaluate whether there have been any changes in progression over time, references are made to previous versions of this analysis.