Learning Curve: How to navigate IB diploma's tricky waters

Cambridge University research shows that the exam results of youngsters after age 16 are a much better predictor of degree success. But that depends a lot on subject choices.
Students in Form Six who have started their international baccalaureate (IB) programmes this autumn will find that success may depend on the subjects they choose.
It's not just parents and students who find it difficult to figure out the IB diploma requirements; I had a myopic understanding of them myself and only a few years ago learned what ab initio meant.
IB subjects are divided into six groups:
Group 1 comprises studies in language and literature in the student's native tongue.
Group 2 covers subjects in a second language that may be tackled at three levels: A2 courses, which require the study of literature, are for students with a good grasp of the language; B courses focus on written and oral language skills for students who have previously studied the language; and ab initio - the lowest level of proficiency, which emphasises basic competency.