Yeah that makes sense. I think this is probably a mistake, as out of every single MATH1901 tutorial, only two classes (mine included) start in week 1.Tutes should start week 2 and cover week 1 content.
Read http://www.maths.usyd.edu.au/u/UG/TU/YR1ADMIN/r/MATH1901.pdf
Some tutorials do start in week 1. Do not assume they don't, but a decent lecturer will ensure students know if there is a tute or not.
Which maths subjects are you doing this sem?So it should be. Maths is great.
Anyway, I'm pretty certain it's a mistake. I have a tutorial for a 3rd year maths subject that apparently starts first week as well, but the lecturer contacted us all and cleared it up. I'd imagine a similar thing is happening with you.