At least when I was in college, there was an approved formula book that was allowed in exams.

Need the formula for the moment of inertia of a shell sphere? The coefficient of linear expansion of gallium? Fourier series of a sawtooth wave? If you've somehow forgotten the formula for the mean of a sample? It's all in there.

There were of course some things that weren't in the formula book - and if you had to look up every last thing, you'd face a lot more time pressure in exams.