I managed to pass by 70% . While LA big data training materials are quite helpful I advise that intending test takers practise very well (thankfully LA provide this for free), read wide (especially AWS big data white papers), and know aws big data services inside-out. The real exam is way more difficult than quizzes in the materials and exam is almost entirely scenario-based with multiple choices - so you'll do a bit of thinking through. Completing the CSA and CDA training materials are very helpful as they complement the big data training nicely, especially security topics - hence AWS' requirement for passing an Associate-level exam. Finally, experience surely counts (or loads and loads of practise in lue - coupled with good time management to understand the scenarios).
Thanks to LA team and goodluck :)