Codeigniter Loop Updates records with single data - php

Question

I am trying to edit student's scores. like the image below. Each time I add the scores to be edited, my loop updates all the scores with only the last score in the form found below the picture of the form, my code and the SQL result when data has been edited.
Below is the code on my controller.
$fetch_session = $this->Home_model->SemesterSession();
$session = $fetch_session[0]->session;
$semester = $fetch_session[0]->semester;
// Form data
$unit = array();
$score = array();
$course = array();
$matno = $this->input->post('matno22');
$dept = $this->input->post('department22');
$level = $this->input->post('level22');
$score1 = $this->input->post('score');
$course1 = $this->input->post('c_code');
$unit1 = $this->input->post('unit');
// for each
for ($i=0;$i<count($course1);$i++) {
$data['score'] = $score1[$i]; //1
$data['unit'] = $unit1[$i];
$data['matno'] = $matno;
$data['level'] = $level;
$data['dept'] = $dept;
$data['course'] = $course1[$i];
$data['semester'] = $semester;
$data['session'] = $session;
if ($data['score'] >=69) {
$data['grade'] = 'A'; //2
$data['remark'] = 'Excellent'; //5
$data['grade_point'] = '5'; //3
$data['quality_p'] = $data['unit'] * $data['grade_point']; //4
} elseif ($data['score'] >= 59) {
$data['grade'] = 'B';
$data['remark'] = 'Very Good';
$data['grade_point'] = '4';
$data['quality_p'] = $data['unit'] * $data['grade_point'];
} elseif ($data['score'] >=49) {
$data['grade'] = 'C';
$data['remark'] = 'Good';
$data['grade_point'] = '3';
$data['quality_p'] = $data['unit'] * $data['grade_point'];
} elseif ($data['score'] >=44) {
$data['grade'] = 'D';
$data['remark'] = 'Fair';
$data['grade_point'] = '2';
$data['quality_p'] = $data['unit'] * $data['grade_point'];
} elseif ($data['score'] >=39) {
$data['grade'] = 'E';
$data['remark'] = 'Poor';
$data['grade_point'] = '1';
$data['quality_p'] = $data['unit'] * $data['grade_point'];
} else {
$data['grade'] = 'F';
$data['remark'] = 'Fail';
$data['grade_point'] = '0';
$data['quality_p'] = $data['unit'] * $data['grade_point'];
}
// Edit The Scores
$query = $this->Home_model->EditResult($data);
if ($query == true) {
$response['Error'] = 'false';
$response['Message'] = 'Result Successfully Modified';
} else {
$response['Error'] = 'true';
$response['Message'] = 'Error Modifying Result';
}
}
echo json_encode($response);
}
here is my model
public function EditResult($data) {
$condition = "matno = " . "'" . $data['matno'] . "' AND " . "course =" . "'" . $data['course'] . "' AND " . "semester =" . "'" . $data['semester'] . "' AND " . "session =" . "'" . $data['session'] . "'";
$this->db->where($condition);
$this->db->update('result', $data);
}
Lastly, This is what happens on my DB table when I update the scores