no coursework for Maths. I only had coursework for Biology.
No. We did practical exams towards the end of year 13 (same as Physics).
You can do a coursework, or a supervised practical in each of the sciences.
No coursework in maths.
Critical thinking is kind of on the same level as General Studies, i.e. a lot of unis see it as a bit dodgy...
From what I've heard from careers staff at my school General Studies is accepted as an A level by all of two universities while Critical Thinking if you have an A is very useful for getting into the top universities because allegedly it proves that you can think for yourself. From what I've heard the AS is actually very similar to the law entrance exam papers some unis use.
I havebn';t started AS Levels yet, so I am not the best person to comment, but at my school there are no lessons for this subject and those taking it have to teach themselves with guidance from the Head of 6th form. I don't think it is a knowledge based course - it seems to be more based on skills.
Best of luck with it.