Having successfully added your Subject Tab, as illustrated in the "Creating/Editing a Subject Tab (New Admin Experience - District Admins)" support page, you can now proceed to add Tests. You can do this by first clicking the "Add Tests" button, as seen below, in the right margin of the Subject Tab that you have created, under the "Subject Tab Tests" section:
The list of tests is displayed; you may add additional tests. The filters located at the top remain unchanged; you also have the option to search for specific test names using the Search box located under the Description section.
Next, please click on the "Add Selected" button, which will appear blue prior to hovering your mouse over it.
The newly added tests are displayed under the Subject Tab Tests in the right margin of the screen. Users have the capability to rearrange or reorder the tests by clicking the arrows icon, which is indicated by the red arrow in the screenshot, located to the left of the add '+' icon. The '+' icon facilitates the addition of more tests, while the 'x' next to each test provides the option to remove existing tests for that Subject Tab.
You've successfully added your Tests and learned how to manage them in your Subject Tab!