According to edition it is 2019.
Some of it seems way too hard particularly どっかい
For example in 第1回 they have explanation note for 牧畜 which explains it in terms 家畜 "畜" I don't know at all. For anyone who has done N3 exam and used this book can you tell if this is a fair source of practice exams? I used BEST for N4 and N5 and passed those and I felt it was at a reasonable level.