Reviews are the testimony of the effectiveness of your course or mock tests. And learners can add reviews easily. And you have the full authority to approve/disapprove or delete the reviews. These all can be managed from the Manage section on your admin dashboard.
Click on Manage from admin dashboard
From the dropdown click on Reviews
Now click on the three vertical dots next to unapproved reviews
now from the pop up menu click on Approve and it will be added to your website