What can be the viable revenue model for a social learning app for the students?

1. commercials / Advertising / leads.
2. In-app purchases of things that they actually need.
3. Freemium model - they only pay for extra services (like maybe you can have a dating feature or a business feature).
4. Offering complimentary services such as loans, help submitting forms, help before interviews and many other ideas.
There are many more options. Happy to explain them on a call.
Good luck
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I think you've got a great answer by Assaf Ben-David.

In addition, it might be worth considering partnerships and who else might benefit.

For example, could your client also/instead be the educational institutions where the students study?

Is there a benefit to them somehow?

It's true that students are cost-sensitive but can you offer them something they can't live without? Worth considering and refining the value proposition and the price point.

Good luck!

Hi, I can help your through a proven 5 step process and questioning tecniques,so that you come to your own workable options for what you want to achieve