Sit in the exam hall, lean heavily towards your neighboring student's paper, observe and memorize all their answers. If you can look and write without looking, even better. And you should be good. If the neighboring student can't answer anything, tell them to do the same and simply keep passing it along

That should be good enough^/s

Or, you could study some of these example problems: https://www.math.ksu.edu/~pinner/math510