You can change the order of tests that are administered each test window. When your students sign in to Track My Progress they will be given the math test by default first. On the next day they sign in (or any day thereafter in that test window) the reading test will be administered.

Click My Settings

Set the test you would like your students to take first by clicking the box to the left of the test and typing "1"

Exit the screen to save changes by clicking Close