Which address do I put down for UCAS?

I've lived in place "A" for the entirety of my life and commute to school every weekday via public transport. However, recently, I've moved closer to school to place "B". But then I'll most likely (95% sure that I will) move back to place "A" by the time the A2 exams come around. So, which address do I have to put down? Does it have to be the same as the one that I've told my school?

Where do you live. Place A or Place B? If the answer is A, then use that address...