yesterday I had dba examination there were 66 questions instead of 60 and and the examination duration was the same and that question too were hard and there were lots of questions that were not covered in the course
Apologies for the late reply. As per exam details on DBA Exam page, the MongoDB DBA exam is supposed to be 66 questions, multiple choices.
If you found the exam tough, I would suggest completing the DBA Learning Path and then giving the Practice Exam to be better prepared for the exam. Also, kindly refer to the exam guide to know what topics can a test taker expect during the test.
Hope this helps. Feel free to reach out for anything else as well.