Exam preparation, spaced repitition, notes taking for medical students -- 2

Hello. Im a doctor and a lecturer. I wish to create a study app for my students. The app should have subscription based features for subscribing to various subjects or chapters. It should include options where I can send notes to my students and they should be able to create their own flashcards from those notes for spaced repitition. Also features some pre set flashcards for them from my side. A section of taking test/quizzes/exams where I can test them and a chat/pm area where I can discuss their progress is also required. All the content will be created by me (notes and medical literature)