Reform question? Help?

hariett1998

(taken from the TSR reform page)

"If I take an AS level exam but do really well and decide that I want to do the A-level will I be at a disadvantage at all?
Most AS and A-level courses are being designed to be “co-teachable” so that both groups of students will learn the same things in year one. The key difference is that those students who have opted for the A-level course will not be assessed at the end of year one."

Is this true? As for some reason my sixth form has put me down for AS 1 year standalone for ALL 3 of my courses (I'm starting year 12 tomorrow and doing maths physcis and economics), which I obviously want to carry all onto A2, why have they done this?!?! HELP?!