Evernote is the top note-taking 

You can study using this note-taking tool, which gathers all of your study materials in one location. Additionally, you can scan and save the notes you’ve already written in the app. You can scan or take pictures using this software to keep all of your ideas, notes, notebooks, checklists, to-do lists, and other items in one location. The unique aspect of this app is that you may save study-related content in a variety of formats, including audio, video, PDF, text, and photos