What is the IIT JEE Aptitude application, how does it work?

According to the introduction of Therithal Info, IIT JEE Aptitude is a Education app on the Android platform. There is currently a 1.01 version released on Feb 25, 2018, you can see the details below.

Aptitudes are separated and provided under many catagory such as Subject, question paper, topic, etc.
Each aptitude provide : Answer, Solution, Explanation, Discussion, Evaluation marks

Online test for all subjects including:
Architecture Aptitude Test,
Chemistry,
Physics,
Mathematics.