Priority System

I'm trying to figure out a way to keep track of who push a button first, second, third and on and on of say about 40 - 100 people. This is for a project that should help a math tutor room in giving priority of which students needed help first and then once a tutor gets to the table (which would be assigned a number ) and pushes a button to turn off its priority the next table that had press the button or may be has their switch on would show up on a seven segment display in that way the tutors know who to help next. Any suggestions would be helpful. Thanks

Alvin

Try this, I haven't tested it but it should work and expanding it to 100 people shouldn't be hard.
https://www.electro-tech-online.com/attachments/quiz-png.9578/