Well Aled got a D, Dave got a D and Chris got a D (or E?) So interesting theory you have. GCSEs are in no way easy, they may be for those 20 years older than the average 16 year old but for a 16 year old the majority are tough.
gcse's i got 3 B's (english language, Geography and science) and 5 C's (Maths, business studies, art, french, English literature) also a C in short course GCSE whatever that is in RE
all you need to do a levels is 5 C's so i just thought do a bit of work and spend most of my time at school having fun. as long as i got the C's i didnt care what they were