If you have a Live assignment for students, you are able to experience the assignment as a student.
To do so, first go to the Student Data Page by clicking the assignment name of any Live assignment listed on your homepage under your Active Assignments list.
Once you are on the Student Data Page, click the purple Try button.
If the Try button is grayed out, this means your assignment was assigned to a group OR the assignment is not yet live.
You can edit your assignment to open it to All Students and/or adjust the start date so that you can test the assignment as a student.
For more information, here's an article on trying assignments!