Don't use sites outside Atlassian's courses for these sources. Most of them are poor quality, quickly get out of date, many have illegally scraped stuff so they can misrepresent it as useful content and get paid for it, and some are downright malicious.
The first two you've given here are parroting questions and answers that I remember writing while I was part of the team writing the exams. I can even point out some of my own language and that's despite having a dreadful memory of what I was doing this time last year, let alone 4-5 years ago) . They're from Jira server systems that are at least two major releases out of date.
Udemy is infinitely better, it's certainly not malicious or has any intent beyond "education", and it's generally up to date (assuming you check the date on the course) but it is just repeating stuff that is publically available. It's not a bad thing, the tutors often look at it differently to the Atlassian trainers, developers, experts and exam writers, and that different angle can be a huge help. But do check the dates on the content - Atlassian releases new stuff often, and actually has a problem with their own docs and training keeping up sometimes, let alone external courses!
The exams are very much pitched at people who have been Atlassian admins for a while, your experience matters a lot more than "book learning", although that absolutely has a place. The exams aim to cover all aspects of admin, and I don't think I know anyone who has used every single thing Jira can do. (I swapped my question writing on "triggers" with one of the others on the team, for example, I just couldn't write for that!)
So, while I'm saying "stick to the Atlassian material", it strikes me that your question is not really a technical one. I don't think you really need to be looking for more practice.
You've completed the Atlassian offerings, so that suggests you know your stuff. Looking for more tests to help you see/try more tells me that you aren't as confident as you would like to be.
But, what stands out in your question is that you say "... they all seem to have somewhat irrelevant questions and the answers provided in many cases seem to be wrong ...".
That screams to me that you know Jira far better than you think you do. Being an Atlassian admin who can get the job done is one thing. Being an Atlassian admin who can point out that other people's docs/exams/assumptions may be wrong is a couple of levels up from that. You'll probably waltz through the exam and spend the last bit of it worrying that you missed something (that you didn't)
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