@Maddus Mattus: The question is, what does the exam tell the teacher if you let the kids cheat. I think it only tells you at how good they are at copying other people's answers (or as evildictaitor says, how good they are at typing the question into Google). It no longer tells you whether the kid understands the subject matter.
At that point, why bother teaching maths, geography, English, science, etc. when all you apparently need to pass any of the exams is just one skill: the ability to cheat.
And you don't even need to be creative to cheat. All you need is for one kid to figure out how to use Google and then tell his friends.