You cannot download the book by Kathy Sierra and Bert Bates as an e-book for free legally on the web. If you do find a copy, then it's an illegal copy.
Don't be cheap and don't engage in illegal activities. Just buy the book.
We do not allow asking for or offering of illegally copied materials on JavaRanch. So, do not ask for those things here.
The
SCJP FAQ contains useful information for preparing for SCJP, including a list of legitimate mock exams.