Honestly, most people will say they work hard - that in their mind is doing home and reading the textbook. End of. That's the standard of an A grade at GCSE but at the standard of a D-U grade at A Levels, that's why people found it difficult. It's not their fault either in any way as GCSEs don't require a lot of work at all. It takes a lot of time to adjust to the work in A Levels though but once you don't do well in January, they exceed in their June exams.