What is the best practice questions resource to buy?

I currently own the kaplan textbook- which I like because I wanted to have a physical textbook to go through. It comes with a question bank and 2 tests. I feel like that isn't enough practice though. Any recommendations on what to buy for additional practice questions and full-length mock tests? I found this link for Chad's videos: OAT Practice. Does anyone know if the "practice tests" are full length tests?

Also, OAT booster comes with 7 full length tests for free.... seems too good...

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