Agreed, truth tables one is important. But it's backwards, you test people on truth tables before teaching them.

If someone is seeing this for the first time they may have never seen some of those gates and you quiz them.

Then finally after passing the quiz, you define NAND and NOR and Inverter.

Swap the teaching one to be the intro to the truth tables one.

Second bit of feedback is the timer. Increase the time allotted. I know them very well and still was struggling to get all the input correct before the timer hit. Or consider possibly just eliminating the timer completely - if your goal is to be sure that they know them.