Edited sentence: CIE is regarded to be one of the most difficult exam boards along with the likes of Oxford, Cambridge and RSA Examinations.Cambridge University is known to be one of the top universities worldwide (number 1 in 2012 according to universityrankings.Many candidates who go on to study at Cambridge University completed CIE courses to an A* standard until at least iGCSE level.The most demanding course in the iGCSE level for CIE are seen as being geography and history and attaining above a C grade is seen to be prestigious.Therefore it is unsurprising that this exam board is known to be much more academically demanding