Today I successfully passed the exam.
It was my first time and I can say that it is doable without purchasing all Udemy courses.
I only bought the Container Dependency IoC one, which helps a lot to understand the basics.
I studied the official questions from the exam guide and tried to find good answers either through free Internet sources, either through official documentation
Finally the mock exams of ad-satour blog helped massively
I can say that it was tough, meaning that there were some questions that were unexpected, regarding exam guide and most of Internet sources. But if you master the other ~ 85%, then you'll be ok.