Get the book.....
I've taken a few sun exams over the years, and can seriously recommend the Exam Cram books. Get the Solaris 10 Exam Cram2 book in paperback, it is much easier to read than just an e-book, plus they have the nice little insert in the front that you can use to jog your memory. Oh and if you want to do well in the part 1 exam I suggest you get some hands on experience with the OBP. part 2, just try to understand all the RBAC and ACL stuff as they ask a lot of questions on that, also read up on NIS. When I did the sol 10 upgrade, I expected to be asked about the new features such as Zones and ZFS, but there were no questions on these subjects.
I'd be very careful about using the braindump type stuff you can get off the web as word is that it is very outdated, and now Oracle have bought Sun :-( they are updating the exams.