EULA and T&C are nothing but a barrier for users. Although it may be a legal requirement, the fact you even need to agree to these is a pain for users, let alone read these.
EULA and T&C are some of the best examples of counter-usability: Nobody wants or has the time to read them; they are long, boring, often phrased in a language that is hard to understand, and likely to be presented at the worse time - when you are buzzing to try out your new product.
UX designers often search for the least harmful way to present these gremlins to users, within the legal requirements.
Annoying Users Could Cost you Business, or even Your Job
So I can hardly think of a better way to annoy users than a quiz on EULA. In fact, if during an installation I would come across such quiz, I would call your helpline and ask the adviser to go with me clause-by-clause through the agreement.
I would even go as far as to say that your idea could well result in you losing your job. Please be aware of the possible dire consequences your proposal may have.
Just imagine my medical insurer would give me a quiz on their T&C. While not understanding these could cost me a fortune, the moment I would be asked to take such a quiz would also be the moment I'll leave my insurer.
How about we stop people from leaving computer-game retailers before we make sure they understand copyright laws, infringement and what they can or cannot do with their copy?
I might come across as bold here, but for a reason - I really think this idea can lead to some serious consequences.
The Right Way
If anything is super important within the EULA, use appropriate design and IA to present key points to the user, and a 'more' link to the full agreement. For instance, on the installation wizard you may wish to include:
- 3 is the maximum amount of device you can install this software on.
- Distribution is great for fresh milk, but alas - it is illegal for you to distribute this software.