The air in the was thick with the scent of cheap coffee and collective panic. On every desk sat a sealed packet with the bold header: PSN-402: Advanced Predictive Systems & Networks.

By the one-hour mark, the room was silent except for the frantic tapping of styluses. Leo watched his screen evolve. The PSN was mapping his stress. It knew he was second-guessing the third equation. It knew his hand was shaking. Then, the screen flickered, showing a graph of his own concentration levels—a plummeting line.

As his heart rate settled, the impossible equations on the screen simplified. The variables aligned. The PSN wasn't testing his knowledge of the network; it was testing if he could remain the master of his own internal network under the highest possible load.

Leo broke the seal. The first question wasn't a calculation; it was a prompt: “Input your current heart rate. Predict your failure margin.”

For Leo, this wasn’t just a grade. "PSN" had become a phantom that haunted his sleep for three months. It stood for Predictive Stress Networks —a theoretical framework that claimed it could calculate the exact breaking point of any structure, whether it was a bridge or a human mind.