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my @classrooms;
my %classroom = 
...
  studentID=>   '$',
  age=>  '$',
);

    my $student = ( studentName => 'John', studentSurname=>'Something'
+,  studentID=>'9534', age=>'12' );
    my $student = ( studentName => 'Mary' ,studentSurname=>'Something2
+',  studentID=>'5489', age=>'13' );
    my %classroom = (classroomID => 10, classroomName=>'classroom1');

 $classrooms[0]->students[0]->studentName