Excellent tests to see how you'll fare on the actual test. They are said to be the closest to the real ones. Other 2 of them are at
http://www.jchq.net/mockexams/exam2.htm and http://www.jchq.net/mockexams/exam3.htm

Each Java objective can be tested individually, your faults can be tested until you understand the study material.
The certification centre enables you to select questions and build your own mock exam. Each mock exam covers the nine objectives and has the same number of questions as the real examination.

In total you can find up to 300 mock-exams.

Good luck!

The Javacertificate.com team

Very good collection of questions. Tougher than the real exam.

65 very nice questions. But the questions do not tell the no. of correct choices making it tougher than the real exam.

Rated as one of the toughest mock exams on the net by about.com and levteck.com.

450 SCJP 1.6 Mock Questions

A very good mock exam containing about 200 questions with explanations. Author has also provided the source code.

A very good applet with all the advanced features. It has 100 questions.

30 questions distributed in 3 tests of 10 questions. Provides brief explaination of the answers.

These are the questions that most of the people miss. Try them out, you'll know your worth!

A mock test comprising of 59 questions based on SCJP2.

Java Web Start based Mock Exam application.
SCJP2 and SCJA/SCEA exams available !

A must before certification attempt. Do check the answers descriptions which clarify some fundemental concepts.

Set of 4 mock exams. 30 questions each

400 SCJP 1.5 Mock Questions

A java quiz presented in an interesting way. Considered to be a little earier than SCJP2 exam.

About 60 questions here while based on the SCJP exam.

Considered to be lot tougher than SCJP2 exam. There are 3 of them.

Test Your Java Knowledge

Mock exam for SCJP with 250+ questions. Users can add their own questions to the database, make their own databases & share their questions thrue email or websites. This application is truly something different. Please try it out.

Regards
Ashish H.

This contains mock tests which are bit tough to answer.

A cool collection of Enum question with excellent explanations of answers

Pass SCJP-5-0 CX310-055 exam in first attempt. 454 questions with detailed explanation and 168 study notes. CX310-055 - Java 5.0 study notes, articles and mock test. 99% pass rate, 100% money back guarantee. Based on latest SUN certification exam pattern. Download exam simulation and study guide. Download practice test for SUN exam CX310-055 Now. Based on latest SCJP-5-0 certification exam pattern. Download SCJP-5-0 CX310-055 Now

Kuldeep Patil
KPIT Cummins Pune

SCJP Success Kit + SCJP DUMP
Declarations, Initialization and Scoping Set-1
Exception Set-2
Var-args Set-3
Autoboxing/unboxing Set-4
enum types Set-5
Collections/Generics Set-6
Thread and Concurrency Set-7
Files and Serializable Set-8
Class and Class Hierarchy Set-9
Fundamentals Mix Set-10
New API and loops Mix Set-11
Mix Set-12
Mix Set-13
Mix Set-14
Mix Set-15

20 Free SCJP 6 Questions

Khalid Mughal& Rasmussen's Mock exam Engine

Another nice Mock Exam

70 questions, no explaination. Couldn't find the original source.
Here it is from 1 to 19
Here it is for 20 to 39
Here it is for 40 to 70

URL was too long to fit in there.

About 40 questions. Questions are good but there is no explanation for most of the questions.

Practice 500+ SCJP questions to prepare for java certification.  You san also save your test session and later try only incorrect answered questions. Free access to all.

Very realistic simulation.

These practice exams focus on specific objectives of the SCJP certification. They should be useful at the final stages of your preparation.