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IB diploma candidates must choose one subject from each of groups 1
to 5, thus ensuring breadth of experience in all areas: languages, the
experimental sciences, mathematics and the humanities. The sixth
subject may be an arts subject chosen from group 6 or the student may
choose another subject from any of the other groups. At least three and
not more than four are taken at the HL (higher level), the others at
(SL) standard level. (Higher Level (HL) courses represent a recommended
240 teaching hours, Standard Level (SL) courses represent a recommended
150 teaching hours.) In addition, all diploma candidates must fulfill
the three central requirements of the IB Diploma, which are the
Extended Essay, CAS (Community, Action, and Service) hours, and the
Theory of Knowledge class.