Personnally, I find DELF exams tough and unecessarily tricky. I did a practice or 2, (I'm a native French speaker from Canada) and I got some of the answers wrong because I did not pay enough attention to details, or because I would justify an answer by choosing a different supporting sentence in the text. (we would totally dissagree on which sentence was "the right one").
In a A2 level test, it is mentionned in a discussion "je vous livre la machine la semaine prochaine". Then there was a statement : "la nouvelle machine va arriver avant un mois". You had to say true, false or "we can't tell". So the test not only test your French level, but also if you can work out that if the delivery will be next week, then of course the machine will be with you before a month.
Another example of the same mentality of trying to trip you in the same test : there were signs, one saying "Danger interdiction de se baigner" and another one "Piscine ouverte l'après-midi. Adulte 3 euros, enfants 2 euros. Réservé aux scolaires de 8h30 à 10h30". There were more signs, but then after you had to decide which one meant "on ne peut pas se baigner en famille tôt le matin". Strickly speaking, both signs should be right : the first one forbiding any kind of swimming it should apply to families who wants to swim in the morning - but this is only my logic, but only the second one would give you a point. So one has to be careful to not answer too quickly.