A quiz that marks itself with no JavaScript at all, so it survives the security filters that strip scripts out of most platforms, and no file is hosted anywhere. What you copy is the whole thing.
CSS can display a counter but cannot compare one, so “at least four correct” has no arithmetic form — every winning combination has to be written out. Five questions with a pass mark of three is ten combinations, which is nothing. Nine questions with a pass mark of five is a hundred and twenty-six, and the code balloons.
The builder tells you the cost as you go. If it gets uncomfortable, either shorten the quiz or turn the tailored advice off — the score itself is cheap at any length, because a counter needs no enumeration.