D282-Cloud Foundations Course

Hey y'all just wondering if anyone knows about the best ways to study for the cloud foundations OA. I see here on Reddit that this YouTube video https://www.youtube.com/watch?v=JsmhEgIV1mQ is highly recommended to review. I am almost half way through the video and feel so drained listening to that dude, LOL. Where are the practice exams that we need to take prior to scheduling the OA? I also don't know how to obtain the exam voucher. I would really appreciate some guidance. Thank you