Test 1 and Test 2 will have questions which check your knowledge of projectmanagement theory and PMBOK : these will help identify your weak areas forfurther study
Test 3 has situational questions and is very similar to final PMP exam
Test 4 covers concepts (and has repetitions) from questions covered in Test 1,Test 2 and Test 3. It is very good practice after completing Test 1, Test 2 andTest 3 and should be taken before final PMP Exams
Guides on all the knowledge areas which includes :
Important Terms and Concepts for all the knowledge areas (to be used as flashcards)
Study Guides on all knowledge areas which highlight areas where most questions are possible
For cost management and time management knowledge areas, study guides about mathematical questions