Congratulations! I'm halfway through my Secondary Music PGCE but once qualified I'll be able to teach Business Studies too as half of my degree was Business.
As has been said, you WILL feel knackered. I'm studying at University of Cumbria, and my placement school first time was really close (in Lancaster/Morecambe) but this time I'm in Cumbria (almost in Barrow!!) so not only do I have to contend with the same tiredness from hard work that I had last placement, but I get the joys of an hours travelling before and after school!
If you've any questions about the PGCE itself, I'd be happy to answer them if I can, but obviously it'll be different for every Uni.