Official CISSP practice question overlap

ddayglo

https://www.amazon.com/CISSP-Official-ISC-Practice-Tests/dp/1119252288/
The "CISSP Official (ISC)2 Practice Test" has 1300 practice questions

https://www.amazon.com/Certified-Information-Security-Professional-Official/dp/1119042712/
The "CISSP (ISC)2 Certified Information Systems Security Professional Official Study Guide" has four 250 question sets

https://play.google.com/store/apps/details?id=com.learnzapp.wileycissp
The "(ISC)² CISSP Official App" has "450+ realistic practice questions"

Does anyone know how much overlap there is between the question sets?

jmasterj206

The first and second don't overlap. I own both. I don't really care much for the questions that come with the book. I have seen some say that the 1300 question exam is too technical, but I can't say so yet since I haven't taken the test yet.