Can I pass CFA level 1 with just CFAI materials?

Basically the title. Or is the curriculum simply too much to digest?

Many people do.

The only supplement I used were practice test. My advice would be if you want to put your dollars towards the most valuable resources, that would be it.

That said, the Quantitative Methods material is awful if you are learning it for the first time. It jumps around all over the place, gloss over major issues, and dwells on silly useless points. You may consider another resource for that section if you don’t already know the material and can use the CFAI resources just for review.