The requirements to receive a certificate for any Module are listed on the enrolment page for that Module.

With Gel Polish as an example, first, you need to have completed The Theory of Nails and passed the respective Assessment. Next, you complete the Manicures and Pedicures module (which includes submitting a few examples of your work) and then book your Manicure Assessment, either in-person or online. Once you reach a passing grade of 80% on both Assessments you will be awarded a certificate and be able to provide Manicure services for clients.