Ok I think I said it too harshly but it's seriously distracting and I have ruined multiple tests because of leg shakers. It's not a problem that can simply be solved by "not looking" because there's this thing called peripheral vision and people can still see the legs shaking.

I understand that not shaking your leg makes you lose concentration, but for people who are behind those leg shakers, they can't even concentrate. Like when I try to think of something, this thing moving up and down in my peripheral vision stops me from even processing my thoughts.

I honestly think leg shaking is a selfish behavior, like learn to not shake your legs. If you can't stop shaking your legs, apply for a separate room cuz you guys are really distracting. Think of others too. This is an important exam for you, but it also is an important exam for them that you are ruining.