oracle sql expert (10g) certification

Hi all

my college had organized the workshop for oracle 10g sql fundamentals and hence i would be giving the sql expert exam shortly.
during the workshop we got e-books with lectures and some practices by oracle university itself.
I just wanted to ask that are these e-books sufficient for preparation or should i go for some extra practice material?
If yes, then please suggest some practice material/books/websites that i can go through.

thanks