I also refer to Paul Sanghera book for SCJP 5.0; But as the mock question go, they seem to be less hard than anywhere I find. Paul has also been contributor to the exam. If you compare the difficulty of questions K&B is hard but Paul Sanghera's questions are not. They are straightforward mostly. Yeah it claims to be Book for beginer too. I think it is correct. But a very beginer can't only go with this.