The IB curriculum is often represented as a circle, with Theory of Knowledge (TOK), Extended Essay and Creativity, Activity, Service (CAS) at its core.
Each of the six academic subjects is graded on a scale of 1–7, with 7 being the highest grade. TOK and the Extended Essay provide a further 3 points, giving a potential maximum score of 45. TOK and Extended essay are graded from A-E. Students must receive at least a D in each of these subjects and score 24 total points (12 in High Level subjects) to earn the IB Diploma. CAS must also be completed, but provides no points.