Score showing during a quiz

Without knowing the version you are using (full version number please) it is difficult to answer.

If you are on a version which older than version 12, I can refer to one of my blog posts:

Popups on Quiz slides? - Captivate blog (lilybiri.com)

If you are on version 12 you may have to wait a couple of months/years before that will be possible. You cannot have stacked objects due to being only responsive projects, not sure if the quizzing system variables are as flexible as before (some give wrong values). The rigid structure with canned templates and blocks makes it not easier. I am at this moment busy trying to take out the feedback messages, answer to a question asked everywhere. That was a breeze in previous versions, but is almost impossible in the New version because of the lack of control over the Submit process. It will take time to get the new version to the same level as previous ones for developers and clients who want more control.