The majority of online marketplaces operate with one of the three basic strategies: commission, subscription, and listing fees. But actually, there are many more revenue models on the market. Each of them has its own benefits and difficulties in implementation. I have already written a blog for this, you may refer to https://techwink.net/blog/how-to-successfully-monetize-your-online-marketplace.

Since there are already so many marketplace marketplaces for students/tutors so using a subscription, escrow or a direct services fee for the transaction wouldn't work. You need to think out of the box. I've successfully helped over hundreds of entrepreneurs, marketplace owners, and businesses, and I would be happy to help you. Please send me more information before scheduling a call - so I can give you maximum value for your money. Take a look at the great reviews I’ve received: https://clarity.fm/ripul.chhabra