You're describing one small part of the family of damages (in the legal sense), and that isn't how common law works. To draw from the rich vocabulary of HN, think of the opportunity cost imposed by the time wasted on preparation and the test itself, that also has value beyond the entrance fee.

Putting that aside, you don't just sue for money, you can sue for different outcomes and injunctive relief. For example you could sue to have the results released as planned.