This person also has composed a very good collection of questions. He is author of the another well known Java Certification book. His book is also known as 'BB' book amond SCJP people. Questions are good. Some qstns were brought to Javaranch for ambiguity.
Questions are simple and good .
It has an option of selecting SCJP1.1 and SCJP2. JDCert.html 19 Jargon - applet to download 140 Another good applet. Has 'short answers' type questions. But doesn't have explanation for the answers . This Java application is the best as accepted by many people .