how to get a fever overnight?

so i have this test tomorrow that did not study for at all. like 0%. and im pretty sure if i give the test, i will fail. so how do i get a fever or get sick overnight so i can skip the test tomorrow. i normally never skip tests or exams but this time everyone has very high expectations from me and i know that if i give the test i will fail. so pleaseeeee help me 😭🙏