JWebPlus Enthuware 1.4 mocks exams are good for practice, but do not expect that you may get same questions there, infact the way questions will appear in the exam may also be different.
I was also having same set of mock practice and few more from internet, and I completed SCWCD 1.5 with 85% on 5 july by preparing around a months.
If you are targetting score in 90+, you may go to purchasing the latest mock
test.
Shalindra
SCJP 1.4, SCWCD 1.5