Name of 1st student in 1st classroom: John
The whole school:
$VAR1 = [
          {
            'classroomName' => 'classroom1',
            'students' => [
                            {
                              'studentSurname' => 'Something',
                              'studentID' => 9534,
                              'studentName' => 'John',
                              'age' => 12
                            },
                            {
                              'studentSurname' => 'Something2',
                              'studentID' => 5489,
                              'age' => 13,
                              'studentName' => 'Mary'
                            }
                          ],
            'classroomID' => 10
          }
        ];