To download the i-Ready subject data files follow the below steps.
Log into the i-Ready site.
Click on the Reports tab
Click on District/School
Click on All Exports
In the Diagnostic Results Export box click on either Reading or Math
Leave all items selected (default). Click on the Create Export button
If needed, select the other subject area in the Subject dropdown and click on Create Export to create an export file for the other subject area
When all exports have been created click on the View Export Queue button
Click on the Download icon to download the subject data file