3:38 As a German, I'm sorry to tell you that this test was indeed correct. The only correct way of saying it is "Sie sind schon informiert WORDEN". I have no idea why you think it should be "geworden" :D
If i'm not mistaken I took this exact Exam 11 years ago. Eventhough I've been living in Germany for few years before I took that exam it's still quite difficult for me. Thank you for making such a nice vdo :)
2:22 - You can only use "Worüber" in this case. "Worauf" is a question word signalising the future. This sentence can't be future-related since the person already knows that they have passed the exam with an A. 3:38 - You sometimes use "worden" instead of "geworden" as the participle past of "werden". Such as in this case. You also use "worden" if there's another participle past before participle past of "werden". Example: wrong - Im Zuge dieser Bewegung ist Vieles geleistet geworden. correct - Im Zuge dieser Bewegung ist Vieles geleistet worden.
Ich denke, Pat7.2 ist schwerer als B1 Prüfung. Ich habe scond die B1 Prüfung bestanden aber Pat7.2 ist schwerer als ich gedecht habe :( Thailandische Bildung ist unsinnig !!!