How to create the Graph using the MPAndroidChart

this the image of my FireBase structrue, Now I want to generate the chart based on the Correct and InCorrect values from the Graph
Additionally, it can, Create two sections

• Correct(which include all the test from all the db) e.g In Half of correct( two parts(test 1: score, test2:score))
• Incorrect(which include all the test from db