Hello Himamshu,
I agree with Dominic's explanation that attempt refers to answering a
particular question with a unique Question ID.
When creating a new timed or learning quiz on the simulator, the default option is to "include only unanswered questions," as you have on your screenshot in a separate post:
www.project-management-prepcast.com/kune...exam-simulator#31726
If you have not adjusted the default option, you are presented with unique questions in all three of your quizzes, so the totals under "Your First Attempt" should be the same as those under "All Your Attempts."
I hope that helps.
Warm regards,
Yazmine Darcy, MBA, PMP, PMI-ACP, CSM
OSP International LLC
The Project Management PrepCast™ -
www.project-management-prepcast.com