Why was my AdSense application rejected?

[DoyaCat]

Hello friends, last night I received a rejection from Google AdSense, and of course, they did not specify exactly what caused the rejection. What do you think could be the reason for the rejection? There are videos embedded from YouTube using iframes on the site – could that be the reason for the rejection? Or could it be from the section about online tests where we have gathered questions from the internet? I don't understand if it's from there or if there is something else entirely. Can you help me? I am open to suggestions and would like to resolve the issues as much as we can before resubmitting for approval. Thank you in advance to everyone who helps. Site URL: https://hemsirekitabi.com