I'm busy going through the past papers too (first time lol, can't believe I've gone this long) - my average is 92-3/100, the specimen one is ridiculously hard and I was pulling an 80. Translations are very odd as well, so is the formatting.
I believe it was a prototype for the future qualification (seems like it was written in 2015) so I wouldn't bother with it. Why the hell did your school use the specimen paper? Surely the 2022 one would suffice? (And that was quite difficult!)