The Project Management Institute® (PMI) has updated their book A Guide to the Project Management Body of Knowledge (PMBOK® Guide).
Before the PMP exam v5 (based on PMBOK Guide v5) ends on March 2018, here are some good websites which offers good reading and practice exams for preparation on your PMP certification.
http://www.oliverlehmann.com/pmp-self-test/75-free-questions.htm
https://www.project-management-prepcast.com/pmp-practice-exam-questions-sample-test
https://www.simplilearn.com/pmp-sample-questions-and-answers-article
http://www.yasna.com/pmp/
https://pmstudycircle.com/2016/11/free-pmp-exam-sample-questions/
https://www.exam-labs.com/exam/PMP
https://www.4pmti.com/pmp-sample-test.aspx
http://www.free-pm-exam-questions.com/
Junexx The Filipino Project Manager 