Back to Steven's comments about IB not being for math and science students, I would definitely disagree with him. I am an IB Physics and Math teacher and it gives the students a great opportunity to delve quite deeply into these topics, even allowing them to take 2 sciences concurrently if they want to.
Just as a curiosity in case you're not aware of it, Kerry, but here in the UK almost any science-inclined child will take 3 sciences concurrently from the age of 11 to 16, possibly specialising down to 2 for the 16 - 18 years once they are close to university choices. I could hardly believe the normal US system when I first heard about it.
I've heard plenty of good things about the IB (at senior school level, I have no experience of the elementary IB), but it seems to be widely accepted in the UK that students who want to specialise and pursue science to university are usually better off taking A levels (or even better, these days, the Cambridge Pre-U).
