After you have explored and browsed through the names of the available benchmark assessments, click on a specific assessment name if you wish to take a closer look at that assessment. You can see read the instructions that are provided to the students, see how many questions there are, and read through each question. In this example, I've clicked on "Grade 6 Mathematics".
To see how the test will be displayed to the students when they take it, click on "Preview". This shows how the test will be administered to the students. In this preview mode, you can actually take the test and answer the questions (i.e., pretend to be a student and take the test). Don't worry, your results will not be stored or recorded. It's just a preview mode.