Am I missing something, or do they not actually say how to score the test? From playing with another version [1], any answer in a grey box counts for 1 point.
I don't see how anyone could get a valid result from self-administering the test if they see the white/grey boxes and especially if they know in advance how the test is scored.
[1] https://psychology-tools.com/test/adult-adhd-self-report-sca...