... but I couldn't do these 2 questions at all!
Welcome to the mad world of elevenplus exams.
Part of the "test" is the use of time and not getting stuck, if you can not see the pattern guess A and move on.
It is 70% ability and 30% how they do on the day, it is not about getting 100% just being in the top group on the day.
DS1 developed a technique of letting go, i.e. the question is ambiguous but I will move on. DS2 is Dr Spock I can see him spending the whole exam on one question and then arguing with the invigilator
however I will develop a strategy to get him back on track.