I think economics is a subject best studied outside of school. This is because you can hone in on areas of interest, and there is a great deal of resources both online and in libraries. It's not a difficult A-Level, but one thing I did not enjoy was the way in which it is marked. The mark schemes are similar to those used by sciences (at GCSE), so a lot of it is memorising keywords rather than showing understanding.
Economics is a fascinating subject area, but I've found that studying at A-Level isn't so rewarding.