I believe LinkedIn works because for one if it's main use cases, there are two matching parts in the graph: 1. If you are looking for the next step in your career, we'll help you find it through search & recommendations 2. If you are trying to find the right candidate for your position, we'll help you find it through search & recommendations
Your use cases for students and teachers aren't like LinkedIn's - they aren't two sides of the same coin. How do the teachers make the Meritful better for the students like recruiters do for employees on LinkedIn?