Elena walked to the front and placed her blue book on Finch's desk. He looked up, surprised. No one finished early.
Then she turned the page to Question 4.
She spread the papers on a secluded carrel, the kind with high wooden walls that felt like a confessional booth. The first paper, from 2015, looked almost gentle. "Solve the following first-order linear ODE: dy/dx + 2y = e^x." She smiled. She could do that in her sleep. wtw 238 past papers
"Miss Elena. They are a key to my mind. And you've picked the lock." She got 98%. The highest mark in a decade. And the following year, Finch changed every single problem on the WTW 238 exam.
But Elena had a secret weapon. Or so she hoped. Elena walked to the front and placed her
"Enjoy the problem?" he asked, his voice a dry rustle.
"Let m(t) = m0 - αt. The equation: d/dt [m(t) dx/dt] + c dx/dt + kx = 0." Then she turned the page to Question 4
Then she expanded, simplified, and applied the underdamped condition. The solution involved Bessel functions of the first kind—a twist Finch had added to make it truly evil. But she had seen Bessel functions in the 2019 fluid dynamics paper, hidden in an appendix of the solutions she'd tracked down.