The first year is pretty much the same difficulty as a-level, but only teaching you the relevant things and giving examples relevant to your course. For example I have to do some physics. But we don't do anything on electricity. And when we do stuff about gravity, it's questions/examples on the tides. So depending on what a-levels you did, the first year will be easier/harder. For my course, relevant a-levels would be; maths, biology, chemistry, geography, physics, geology, ict, environmental science ... and I did the first 4 of those, so am finding it quite easy. But my friend only did one of those, so is finding it a bit trickier.