So I've been putting off talking about this but I think it might help someone. I failed the NBT in November and again in February, both times by a pretty narrow margin. The first time I barely studied, figured I could wing it. The second time I did use a NBT practice test I found online but it was honestly outdated and nothing like the real thing. I scored a 61% on my own practice run and thought I was fine. I was not fine.
What actually turned things around for me was finding a proper study guide that broke down the quantitative literacy and academic literacy sections separately. I spent three weeks, about 45 minutes a day, just drilling those two areas specifically. The math isn't calculus-hard but the way questions are worded trips you up if you're not used to it.
My exam tips for anyone prepping: don't ignore the reading comprehension section thinking it's easy. That section cost me points both times. Anyone else been through multiple attempts? Happy to share more about what I used if it helps.