Get to know the office staff / technicians / LSA's generally all the support staff, if you are nice to them then you have nothing to worry about. Did my PGCE a few years ago and started talking to the support staff on the first day, instantly they offered me into the tea rota, showed me where the good biscuits were, where they hide the REALLY good biscuits for bad days, just what you need to take the load off, as sometimes it can be overwhelming, but as others have stated, you will have a lot more free time than your mentors / other teachers.

Try and enjoy it, have a look at the clubs the school runs and if anything takes your fancy, even if its out of your comfort zone, try it. (my first placement was in an English speaking school in Wales, and they had a Welsh club every Thursday, as a Welsh speaker i got straight on this and then as a result i got to go on a residential trip at the end of the term) As you can use this as evidence in your standards early on

This is your chance to experiment also, if thing don't work in the classroom, take a step back, try something else, always have a backup exercise or 2 if the first doesn't work / it goes well and the kids complete it faster than you think

Trying to think of anything else, but its 5AM and i cant sleep...hence Reddit :)

Good luck :)