What is the passing marks for all 4 CCNP exams?

Answer 1

It varies as the exams get revised. Usually passing is between 700 to 775 out of 1000, on a scale from 300 to 1000. Try checking some exam prep web sites, they usually have a rundown on the time limit, number of questions, passing score, etc. Example links:
http://www.simulationexams.com/exam-details/routing.htm
http://www.simulationexams.com/exam-details/remote-access.htm
http://www.simulationexams.com/exam-details/switching.htm