To be honest with you, I took two kind of mock
test for scjp 5.0, I think the one from Bert Bates's new book for scjp 5.0 is very similar to the real exam. the other one is not so close to the real exam questons, but is good to learn JAVA.
What I can say to is if you buy the book written by Bert Bates and read it carefully. You'll pass it very easily.
I won't introduce any other books or mock exam to you since I firmly think Bert Bate's book is the best.
I also think MasterExam for scjp 5.0 could be designed by Bert Bates. If you have extra money, go and buy MasterExam for scjp 5.0. I think this could be a good idea.
That's all I can tell you. Sorry for not providing the links you wanted.