Cleared the SCJP 1.4 certification on Friday with a score of 91%. In my opinion Khalids book is a great place to start and Dan Chisholm's got a great question bank, give as many of his tests as possible. The final score is approximately the average of the scores you get in Marcus's tests. His question bank is absolutely worth the $10.
BTW does any one else also feel that the test is too easy?