Fun part about coming from the middle of no where. Doesn't matter though, still got into what I wanted.
You;ll be fine. You go to a big fancy school that avoids such problems!
For SDD I got high band 4, which is what I expected, but for everything was dragged down because of my school so I got less then I hoped. Going by the calculators my school costed me 3 atar points... so yeah :p
Ah ok, well for me, SDD was the one that was never going to count, so I didn't bother working hard at it. Only did it as the class was a lot of fun :P.
You'll do fine... band 5 is still good.