I think so.. I might/will anyway, just to see what happens. I had my German exam on Wed and they didn't really look at the notices, just for our student numbers etc, and they didn't sort of cross check to see if we were in the right session - at least that's what I think they did.
Also got two notices for that one and after ringing BOS they said 'Just go to one and they will mark you off. The main thing is that you turn up' - and by 'turn up' I suppose that can be veery veery early?.. argh dilemma.