Advice in preparing for Japan/N2

Hi!

I’ll be going abroad to Japan this September for a year, where I’ll be doing a year of Japanese studies at a university. I’d say my Japanese is currently at around a solid N3 (my kanji could use some work, granted), and I just started vacations so I’m going to have time to grind Japanese again thankfully. I want to prepare as best I can for when I arrive to Japan, so I can make the most out of my time there, but I’m honestly not sure how to do it.

I feel like reading Manga/light novels has definitely helped me improve a good amount, and I’ve thought of just word mining from them and learning from that, but I’m not sure it’d be enough. Surely all the important/necessary words can’t just be found within light novels/manga right? I’ve also tried using online anki decks, but some of them feel honestly pretty bad. Like, they won’t teach me words we use everyday, like floor, sharp, impressive etc. but they want me to learn words like　回数券, which I don’t think I’ll ever use, or at least nowhere near as often as those other words.

Finally, I’ve also considered using textbooks like Tobira to cover up my kanji/vocab gaps, or Shin Kanzen Master or Nihongo so-matome to advance to around N2 level, but that’s an investment and I’m not sure how good they are.

What recommendations do you all have to make this jump/best prepare for Japan? Ideally I’d like to be able to go with around an N2 level (I’m willing to put in 4-5 hours a day to make this happen, but ideally a bit less lmao bc I need a break from studying admittedly). Has anyone found any success with any particular methods? Maybe there’s actually good decks out there I’ve just overlooked, or methods I’m completely ignoring. Thanks so much!