Ticking Clock Panic: When Does Desperate Become Dangerous?

My cell biology professor just dropped the final grade weight, and suddenly, this upcoming exam feels like the only thing standing between me and summer break or total academic failure. I've hit a wall where studying is ineffective, and the stress is making me physically ill. I saw a shady post online promoting dedicated online biology exam help, and while I immediately dismissed it as cheating, the sheer availability of such options is messing with my head. How do you all mentally push through when the pressure is so intense you feel like you might buckle? I need perspective, fast.