Your school account will have a parent called Test Parent that you can assign students to and use to see the reports that parents of that student would be seeing. You may find this useful to understand what parents will see when you are first setting up the App for the school, as well as to see what reports specific parents are seeing on their phones later on.
To configure the test account to point to a particular student:
Go to My School on the top menu, then select Parents
Search for "Test Parent" and click the 3-dot button on the far right
Change the email address to the email address you want to control the account (e.g. your own email address)
Search for a student that you want to add to the account and click Save Changes.
When the Test Parent has a student assigned (assuming the student has a Date Of Birth set in the system - a technical requirement) you will be able to send an invite to the Test Parent on the assigned email. To do so find the parent the Parents list again, click the 3-dot button and click Send Invite. Find the invitation email that has been sent and open it on a phone that already has the App installed, then follow the instructions to activate the account.
Publish reports for the student you have attached to the Test Parent and you will see the reports that a real parent of that student would be seeing in the App.
Please note that any real parents that have activated their accounts will see all active published reports which cover their children, even if you were only intending to publish to the Test Parent. If you want to remove any report so parents cannot see it, find the report in My School > App Reports and click Delete.