Not sure why people keep suggesting UWorld when you can fail with any review... nothing is a guarantee.
If you are failing at 75 two times, you should really look into why you think you are, study differently, check out those evaluations and go back to reviewing content AND questions/rationales, review content you keep scoring low on. I know people say the amount of questions you get doesn't matter, but if you understand how the CAT is, you'll see you kept going further down away from the passing mark to being a safe nurse. Understand how the test works, its areas, refresh on content, eliminate distraction, positive affirmations, and study your butt off. YOU CAN DO THIS.