I highly recommend the Blueprint Games book. I'd buy it closer to prep time, since they may update it.
The Manhattan guides are great -- just get the latest. They were updated this year in June or July. I'd be surprised if they were updated again next year. Kindle versions are $10 each.
Definitely check out the free 7sage games videos, once you start studying.
The entire 7sage course may be an option that works for you, since it's not too tough on the wallet.

(I haven't seen what's inside, but the games videos are pure gold.)
Read jeffort's posts on the three stages of prep and leave plenty of time after you've learned the material to practice and do deep review. That's where the magic is.
Best of luck!