She sat next to me in the classroom. We exchange knowledge with each other on some subjects, but there is nothing we will discuss throughout. Time to eat a snack or bathroom, we would be together.
She sat beside me in the classroom We share their knowledge in certain subjects, but there is nothing we will discuss throughout. Time to go to the bathroom or eat sweets, we will go together.
She sat next to me in class. We share knowledge in some subjects, but what we are discussing. Time to go to the bathroom or eating sweets we go together.