Mark as Completed Feature in React Native App

I am building an app where students can look at questions from previous years and study (no answers just question). I am using Sanity CMS as "backend" since this is just users studying questions and not really backend "heavy" web app. Anyways, I want to have a "mark as complete" feature which will be used to keep track of how many questions have been completed so that I can show it in the dashboard in a chart. Since there will be hundreds of questions, I am not sure of the best way to implement this feature. Also, if a question has already been marked completed, there will be a bright green color in the checkbox as compared to grey when unchecked. Is it even good to do with SanityCMS? Or should I use other db engine? Any idea on how to do this would be great. Thanks.