What you want is the Red Hat Learning Subscription (RHLS).
It's the easiest, and cheapest way to consume Red Hat training content - and exams.
Learn more about it here: https://www.redhat.com/en/services/training/learning-subscription
Personally, I use it for my learning needs.
I wouldn't call 6000$ cheap...
I would be also happy to see a prep or practice environment for exam preparation as it really looks like the most difficult part is not the question itself, but how to purchase an exam and how to get ready for it specifically tailored for the exam...
kinda frustrating experience so far :(