I am using JWebPlus V4 ( it has got 7 complete tests) and you can customize tests as per your flavor (no of questions to be asked, total no. of questions to be scanned for questions in the exam, and topics to be included in the exam). It also tells you the detailed answer for the questions. You have the option to take the mock exam in sessions i.e. you can attempt 20 q's a day then 25 next day and remaining third day.
So i am satisfied with the JWebPlus4 test engine for scwcd 1.4.
Note V4 is the a for scwcd1.4 exam. V7 is for earlier version of scwcd exam.