Check these links for Java Certification...
http://apollo.netservers.com/~femibyte/javaquestions.html
http://eddiemcnally.hypermart.net
http://home-1.worldonline.nl/~bmc88/java/javacert/index.html
http://home-1.worldonline.nl/~bmc88/java/javacert/newcert1-10.html
http://home.worldonline.nl/~bmc88/java/javacert/newboone1-19.html
http://java.about.com/msubcert.htm
http://www.spirit.net.au/~robm/cert
http://javacert.com
http://www.javaranch.com
http://www.acmerocket.com/skinny/
http://java.sun.com/docs/books/tutorial/information/download.html
http://members.theglobe.com/apoddar/questions.html
http://suned.sun.com/usa/cert_test.html?content=cjp11_quest
http://suned.sun.com/usa/cert_test.html
http://woj.com/tech/javacert/
http://www.aber.ac.uk/~jjh/Java/
http://www.aber.ac.uk/~jjh/Java/certification/javacert.html
http://www.axtive.com/jcertify
http://www.code316.com
http://www.geocities.com/SiliconValley/Cable/1025/exam1.html
http://www.geocities.com/SiliconValley/Cable/1025/exam2.html
http://www.geocities.com/SiliconValley/Cable/1025/exam3.html
http://www.geocities.com/SiliconValley/Circuit/8217/
http://www.geocities.com/SiliconValley/Network/3693/
http://www.geocities.com/SiliconValley/Orchard/9362/java/javacert/
http://www.geocities.com/SiliconValley/Screen/5046/index.htm
http://www.lanw.com/java/javacert/HardestTest.htm
http://www.lanw.com/java/javacert/TestApplet.htm
http://www.lanw.com/java/javacert/default.htm
http://www.learnjava.com/newtest.html
http://www.marcusgreen.co.uk
http://www.michael-thomas.com/
http://www.michael-thomas.com/java/index.html
http://www.mindq.com/java/test.html
http://www.mindq.com/online/Sun.html
http://www.sarga.com/java/jac.htm
http://www.software.u-net.com/applets/Exam/Exam.htm
http://www.software.u-net.com/javaexam/javaexam.htm
http://www.software.u-net.com/javatutorial/JavaCertCh01.htm
http://www.software.u-net.com/javatutorial/javacertintro.htm
http://www.software.u-net.com/jcertfaq/jcertfaq.htm
http://www.woj.com/tech/javacert/
http://www.woj.com/tech/javacert/discussion/
http://java.about.com