Patron Saint of test taking?

I have my german test tomorrow and Monday. Everyone in the class is sweating blood over it. We have to pass it in order to move on to the next course level. The test is two hours long tomorrow, one hour of grammar followed by one hour of writing a text. On Monday we have the speaking portion of the test. On Tuesday we receive our certificate (proof of taking the class) and also learn whether we can move on or not. I feel I've learned a lot in this class but there is still so much I don't know. And now the test, the test! Is there a patron saint of test taking to whom I can pray or make an offering?