excluding knowledge check questions when reviewing/retaking the quiz captivate 8

Instead of using a question slide with the points set to zero you may wish to build your knowledge check questions yourself using advanced actions.

Here is an example of such an interaction (it's an old video but there are others on my YouTube channel as well).

https://www.youtube.com/watch?v=O6aiGw5CyyY

How do you define a 'knowledge check' since the new KC slides didn't exist in CP8? Do you have a score = 0 for them?

You'll find a description of a work flow to skip questions during review, but not for the same use case. That is the reason why I asked how you did define the KC slides, because you'll need a variable to check for the skip condition:

Limit Review to Incorrect Answers (Captivate 6) - Captivate blog