IB Diploma - Theory of Knowledge TextbookWatch
Unfortunately I can't remember the exact one I used but this looks similar: education.cambridge.org/uk/subject/philosophy-and-critical-thinking/theory-of-knowledge-for-the-ib-diploma-(full-colour-edition)
But I'll be honest, I didn't used them all that much anyway. I either used online resources or lessons. ibsurvival.com has a lot of resources on tok as well.
You can stil do well in tok without lessons seeing as there's no exam. It's just the presentation you need to keep in mind for now.