I am not saying that is the right way to do a selection of students, but it just reflects the reality how this selection is done in practice in many places. The differentiator between an excellent grade and an average grade is often not the basic understanding of a topic (as this is more difficult to test), but how detailed you can repeat what was expressed during the classroom sessions. To pass tests successfully, in many cases you will need to be able to parrot individual facts presented in this specific school / by your teacher, if you agree with them or not. In addition, the content that will be asked in the test will differentiate greatly from school to school and from teacher to teacher. Also you do not want to spend time repeating questions, which you already know in and out, only because somebody else did the deck and made a different selection of the content then what would fit to you. You will not create questions for things you already know. In addition, these own created study material will only consist of content, you personally lacking knowledge of. This process already greatly enhances your general understanding of the topic. Creating your own questions will force you to think about the topic deeper and building your own storyline to get the dots connected.
Can I not just use any of these decks, which are already out there? Of course, one can learn from pre-made cards created by somebody else, but the learning efficiency is by far not the same compared when you build your own questions.
Why is creating your own flashcards for study so important. The advantage of Pauk flashcards campared to other tools you will find in the ease of creating own unique digital flashcards (flashcard maker app).