Thank you, it was mostly fine from what I remember, it was kind of similar to the N5 actually.
The hardest part for me was grammar, connecting the right particle sometimes seems tricky, and those questions that you have to put the sentence in the right order are also tricky because with Japanese you can speak in a lot of different ways, so it seemed like there was more than 1 right answer even though there was not (not sure if I’m making any sense hahah)
About the listening session, here in Brazil they asked the class about how loud they wanted the speakers to be, so if you were assigned a seat at the end of the classroom, they would ask you if you can hear it well at the seat you are in or if you want it a little bit louder, the other students were not noisy from what I remember, everyone was just trying to concentrate to listen well to the sentences.
Good luck with the N4 this December, if I could give any tips, it would be Mock Tests, do it every month or more, always good to measure your progress, especially when the test is getting closer, so that you can see how much studying you still need to do before the test and which area you need to focus on the most.