As far as I understood, the scoring of IQ tests is done by hand.
Even if there are only few hundreds of users here, it can be tyring.
Why don’t just use a simple server script comparing answers with numbers in the related file?
For manual scoring, I think it makes sense to have a comment field for every question.
Sometimes several options seem equally suitable.
May be the test taker don’t see the more obvious choice, or may be there is a flaw in the test itself. So, a comment field, where the taker explains his choice, may provide a good hint.