Indeed, anyone who will practice trading will be able to know that answering must be done first before you can practice trading and as you have mentioned answering all questions in the quiz will not affect anything since it is serve as the ticket to start trading and for further knowledge about trading.
Okay, you convinced me. It's easy to add this information.
Another option for demo trading on Bitfinex was also discovered:
https://support.bitfinex.com/hc/en-us/articles/900001525006-Paper-Trading-test-learn-and-simulate-trading-strategies-