NAB posts have been alternatively been advertised by FPSC and private testing services. Hence, there are minor differences in the types, depth and pattern of the questions. But the basics still remain the same. Also note that the syllabus for this time is also different. Science is not included.
Here are the past papers.
https://www.facebook.com/groups/CSS....5358114228380/
This guy is a valuable member for students and aspirants applying to Govt Jobs. He has personally collected and organized past papers for nearly all popular jobs. He even has past papers of various posts (including NAB) scanned from past papers books.
You have also posted this question in the wrong section. NAB has its own section on this forum