This might help answer your question. If you mean is it open book as in, if you had the book at home while you were doing the online test and you were looking up the answers, I guess there’s nothing to stop you… I’ve heard of people getting family members to help answer the questions while doing it at home, so I guess it’s not impossible lol. I’ve got a proof of age card which I haven’t had any trouble with as a form of ID. As in, I’ve never had anyone refuse it.

Edit: another thing to consider is if you’re using a learner’s permit as ID you’ll have to renew it at some point, I think it lasts 10 years? Whereas a proof of age card is forever.