AS Economics is the only one of those that I've done - it's manageable bordering on easy, content-wise at least. As long as you can write well structured essays the subject isn't challenging at all at this level.
I'd give it a 4 - sorry I can't comment on the others.
GCSE Maths: 1/10. No comment really.
GCSE triple science: Memory game, no difficult concepts. 2/10.
EDIT: If someone disagrees with me enough to thumbs me down, they should at least have the courtesy to let me know why they disagree. It's pretty pointless otherwise, and suggests they simply didn't like what I said without any proper reason.