I think this is a great product.
Firstly, it is very appealing to look at. It's very crisp and clean in both the printable and the pdf. Nothing bad to say about this. It kind of reminded me of a standardized test like the ACT but not boring.
Secondly, the contents of this product is nice and clear. It's pretty cool to have a system to help you refresh on things or, in my case, aid with learning the rules. I think a lot more situational rules would be nice however, this all worked very well.
Overall, I think this is nice but, could be better with more detailed or situational questions. Nevertheless, this is still a great tool.
I'd recommend this to everyone who is a DM, aspiring DM, or even players who want to test their knowledge as well.
For the creator, thank you for putting the time to make this!