Following links gives information on SCJP exam study material, way of preparation and simulation downloads.

http://www.javabeat.net/

http://www.anilbachi.8m.com/docs/certification/jcpquestions/index.htm
http://www.jchq.net/mockexams/exam3.htm
http://liang.armstrong.edu/selftest/selftest5e?chapter=2
http://www.lanw.com/java/javacert/HardestTest2.htm
http://www.javaolympus.com/J2SE/JavaCertification/JavaCertification.jsp
http://home-1.worldonline.nl/~bmc88/java/javacert/index.html
http://enterprisedeveloper.com/jcertify/
http://www.aniyog.com/java/certification/java_mock_test.htm
http://www.geocities.com/technofundo/tech/scjp/scjp1_4.html
http://www.jchq.net/mockexams/exam2.htm
http://www.danchisholm.net/july21/topic/index.html
http://www.jdiscuss.com/index.html
http://www.java-tips.org/
http://www.javaprepare.com/quests/question.html
http://saloon.javaranch.com/cgi-bin/ubb/ultimatebb.cgi?ubb=forum&f=24
http://saloon.javaranch.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic&f=84&t=000189
http://faq.javaranch.com/view?ScjpFaq#sectionWiseMocks
http://faq.javaranch.com/view?ScjpMockTests
http://www.vivek.4mg.com/javacertification/jsexam.htm
http://www.javaranch.com/maha/_Mock_Exams/_mock_exams.html
http://www.javaranch.com/gramps/SCJPLinks.jsp
http://www.mihaiu.name/2004/sun_java_scjp_310_035_test1/
http://www.examsguide.com/scjp/freequestions.html
http://www.witscale.com/scjp_studynotes/chapter9.html
http://www.witscale.com/my_witscale.html
http://java.about.com/od/certification/tp/topscjpexams.htm
http://www.acmerocket.com/skinny/index.html
http://www21.brinkster.com/infoway02/asp/AllQnAns4.asp?start=100&end=200
http://www.geocities.com/SiliconValley/Screen/5046/
http://www.javabeat.net/javabeat/scjp2/mocks/index.php?page=mock13
http://www.javabeat.net/javabeat/scjp2/downloads/index.php
http://www.geocities.com/skmajji/Main.html

http://schneider-electric.com/sites/corporate/en/home.page