You can create a Test Student by going to: 

- Sentral Setup cog (top right)

- Data Synchronisation 

- Manage Students (left menu) 

- click Add Student 

- fill in the Required fields

- Save to apply.

Then, you can either create a test academic class or add the student to an existing academic class: 

(whilst still under Data Synchronisation menu) 

- Manage Classes (left menu) 

- click on a Class name or click Add Class

- once created, Add your test student

- Save to apply.

Once you have done the above, you'll need to sync this data through to Sentral, so go to: 

(still under Data Synchronisation) 

- Administration Data (left menu)

- Data Sources

- click Synchronise Now.

Once you have done this, you can then create a test Parent account within the Student and Parent Portal Setup > Manage Users, then link to the test Student created above.