If a student wants access to Sefaira, there are two ways to achieve this. Primarily, you would discuss this with your professor. This assumes that they have already applied to the program; requesting access for their class. You can find out more details here: https://sefaira.com/sefaira-educational-program/
Alternatively, if a student wants an individual license, and not through the class, they would need to purchase the student version of SketchUp Studio. More details on that can be found here:
Creation Engine, Inc.