Which 1985 film is about five students serving Saturday detention?

In 'Grease', what is the name of Danny's gang? In 'West Side Story', what are the two rival gangs? In 'The Outsiders' (1983), what are the two rival groups? Which 1986 film is about a teenager who skips school with friends Cameron and Sloane? In 'Mean Girls' (2004), who plays Cady Heron? In 'Clueless' (1995), who plays Cher Horowitz? In 'Legally Blonde', to which law school does Elle Woods go? In 'Good Will Hunting', at which university does Will work as a janitor?