The older kids can be quite imposing as they're more independant so they're more likely to question you, but in some ways that can be quite a good thing.
It sounds like you had a fun time in your placements, how long did you do them for?
As for text books, I've had a peek through all of them but no major studying, I absoloutly LOVE collins grammar rules though, it's so much fun and gives me so many ideas.
How are you dealing with the impending arrival of uni? Is this your first experience like this? Are you just out of school or are you a mature student?