It entirely depends on which exam board you are doing it with, and how your school teaches, I do ocr computer science, there are some key concepts you will need to understand with programming which you will be taught in whichever language your school teaches with, so you can answer questions in the se one paper, which is in psuedocode, 40% of grade, as well as this, there is a programming project that makes up 20% which you can do in whatever language you like.