There is an interesting trend in test scores in exams (GCSE and A-level) in the UK: they are increasing, or so the trend in the grades would tend to show. This is known as grade inflation and affects other countries, too.
Why is this? I have heard several reasons. The first is that students are just generally getting smarter. The second reason I have heard is that exams are getting easier. To me (as a student), it personally seems like the exams are getting easier, although it is hard to judge. What independent research has been performed to determine if it is exams or students?