Peer pressure is a tool. The friend who makes studying look normal is using it for good.

The pull of a group is neutral machinery; it works the same way whatever it is pointed at. Whatever your friends treat as ordinary becomes ordinary to you, which means one person quietly making an unglamorous habit look unremarkable can change a whole circle without ever arguing for it. Nobody experiences that as pressure, which is exactly why it works.

Rather than telling your friends to do something, do it in front of them without commentary. Study where people can see you, or ask someone to come along. Being the one who makes a good habit look normal is a real contribution to a group.