Core maths (CM) is a Key Stage 5 qualification aimed at students who achieve a grade 4 or higher at GCSE Maths but do not go on to take AS or A level Maths. Its stated main purpose is to increase participation in post-16 maths and to help develop students' mathematical knowledge and its application to a range of different areas. This means CM qualifications may help students in subjects (taken concurrently) which have some mathematical content, such as geography, business, engineering, and the sciences. The analysis presented in this report is part of a larger research project, investigating whether CM (from any awarding organisation, not just OCR) benefits students in other subjects taken concurrently, or in later Higher Education (HE) study. There are different specifications for CM qualifications (across all awarding bodies) which vary in their content and therefore could support different subjects taken concurrently. In this report, the focus is on the two OCR specifications only: (1) Core Maths A Mathematics Education Innovation (MEI) Level 3 Certificate; and (2) Core Maths B (MEI) Level 3 Certificate. This report describes an analysis of the uptake of the two different OCR Core Maths specifications and whether they support different subjects taken concurrently. [This work was carried out in the Secure Research Service, part of the Office for National Statistics (ONS).]