Logically speaking, you are correct, but human beings are rarely logical; even less so when there's a group of them.
Taking the test may provide self-validation, but it will do so at the expense of all of your classmates failing the course. In the end all you'll prove is that you were so inept (socially) that you were willing to sacrifice all of your peers for nothing more than pride.
Pride? No, partially a desire to actually get all of the education you are digging yourself into debt for, partially out of annoyance of a childish prank, and even more partially out of annoyance at a childish prank that assumes your cooperation.
If they want to be a bunch of clowns, that isn't my business. If they choose to make their clowning my business, then I am not responsible for the fallout when I don't fall into step with them.
And make no mistake about it, there was without a doubt social pressure and coercion in this situation. Your response to me demonstrates that quite clearly. If a cornerstone of your prank is your peers not being "squares", then your prank is coercive.
Taking the test may provide self-validation, but it will do so at the expense of all of your classmates failing the course. In the end all you'll prove is that you were so inept (socially) that you were willing to sacrifice all of your peers for nothing more than pride.