https://play.google.com/store/apps/details?id=com.herokuapp.studylens.
This is an app that provide answers in maths and chemistry and also has a summarizer, for breaking down complex text in an easier way to understand.
All the student has to do is to snap the question or paragraph of text. The app is currently in beta.
Here is a link to the app on playstore.
https://play.google.com/store/apps/details?id=com.herokuapp.studylens