ช่วยด้วยค่ะ เรื่อง sum score จาก radio buttun

$total_mark=0;

foreach($_POST['choice'] as $key=>$value){

	$sql1 = " select * from question where q_id = $key and q_ans = '$value' ";
	$rs1 = mysql_query($sql1) or die(mysql_error());
	if(mysql_num_rows($rs1)>0)
		++$total_mark;

}

<?php

include "connect.php";

 if($_POST)
 {
	 $idcard = $_POST['idcard'];
	 $perfix = $_POST['perfix'];
	 $name = $_POST['name'];
	 $department = $_POST['department'];

	 }

$sql = "select * from question,answer where question.q_id = answer.q_id and q_category = '2' and 
											question.q_department = '$department' and q_status = '1' 
											order by question.q_id ASC ";
$rs_show = mysql_query($sql) or die(mysql_error());

$i=1;

	while($row = mysql_fetch_array($rs_show)) {
				
	echo "<table>";
	
	echo "<tr>";
	echo "<td align='left'> "."<b>". $i .". ". $row['q_quest'] ."</b> </td>";
	echo "</tr>";
	
	echo "<tr>";
	echo "<td align='left'>"."<input type='radio' name='choice[$i]' value='1'  />"." ก. " .$row['a_ans1']."</td>";
	echo "</tr>";
	
	echo "<tr>";
	echo "<td align='left'>"."<input type='radio' name='choice[$i]' value='2'  />"." ข. " .$row['a_ans2']."</td>";
	echo "</tr>";
	
	echo "<tr>";
	echo "<td align='left'>"."<input type='radio' name='choice[$i]' value='3'  />"." ค. ".$row['a_ans3']."</td>";
	echo "</tr>";
	
	echo "<tr>";
	echo "<td align='left'>"."<input type='radio' name='choice[$i]' value='4'  />"." ง. ".$row['a_ans4']."</td>";
	echo "</tr>";
	
	if ($row['a_ans5'] != ""){
	
	echo "<tr>";
	echo "<td align='left'>"."<input type='radio' name='choice[$i]' value='5'  />"." จ. ".$row['a_ans5']."</td>";
	echo "</tr>";
	
	}
	
	$i++;
	
	echo "</table>";
	
	}

?>

<br>
<div align="center"><input type="submit" value="ส่งข้อสอบ" name="submit" class="btn btn-primary"></div>


<input name="idcard" type="hidden" value="<?=$idcard;?>" />
<input name="perfix" type="hidden" value="<?=$perfix;?>" />
<input name="name" type="hidden" value="<?=$name;?>" />
<input name="department" type="hidden" value="<?=$department;?>" />

 <?php
	
  include "connect.php";
   
 if($_POST)
      {
	 $idcard = $_POST['idcard'];
	 $perfix = $_POST['perfix'];
	 $name = $_POST['name'];
	 $department = $_POST['department'];

      }

$total_mark=0;
foreach($_POST['choice'] as $key=>$value){

$sql1 = " select * from question where q_id=$key and q_ans='$value' ";
$rs1 = mysql_query($sql1) or die(mysql_error());

$total_mark += mysql_num_rows($rs1); 

	mysql_free_result($rs1);

	}
	
	$sqlEdit = "UPDATE tester SET t_score2 = '$total_mark' ";
	$sqlEdit.= "WHERE t_cardid = '$idcard' ";
	$result = mysql_query($sqlEdit)or die (mysql_error());

	if($result)
			{ 

			echo "<br>";
			echo "<h2 align='center'><b>บันทึกข้อมูลเรียบร้อยแล้ว สิ้นสุดการทดสอบ..</b></h2>";
				
			}
			
			else{
				
				echo "<h2 align='center'><b>เกิดข้อผิดพลาด!! ไม่สามารถบันทึกคะแนนได้</b></h2>";
					
				}


  ?>
  

<?php

include "connect.php";

 if($_POST)
 {
	 $idcard = $_POST['idcard'];
	 $perfix = $_POST['perfix'];
	 $name = $_POST['name'];
	 $department = $_POST['department'];

	 }

$sql = "select * from question,answer where question.q_id = answer.q_id and q_category = '2' and 
											question.q_department = '$department' and q_status = '1' 
											order by question.q_id ASC ";
$rs_show = mysql_query($sql) or die(mysql_error());

$i=1;

	while($row = mysql_fetch_array($rs_show)) {
				
	echo "<table>";
	
	echo "<tr>";
	echo "<td align='left'> "."<b>". $i .". ". $row['q_quest'] ."</b> </td>";
	echo "</tr>";
	
	echo "<tr>";
	echo "<td align='left'>"."<input type='radio' name='choice[{$row["q_id"]}]' value='1'  />"." ก. " .$row['a_ans1']."</td>";
	echo "</tr>";
	
	echo "<tr>";
	echo "<td align='left'>"."<input type='radio' name='choice[{$row["q_id"]}]' value='2'  />"." ข. " .$row['a_ans2']."</td>";
	echo "</tr>";
	
	echo "<tr>";
	echo "<td align='left'>"."<input type='radio' name='choice[{$row["q_id"]}]' value='3'  />"." ค. ".$row['a_ans3']."</td>";
	echo "</tr>";
	
	echo "<tr>";
	echo "<td align='left'>"."<input type='radio' name='choice[{$row["q_id"]}]' value='4'  />"." ง. ".$row['a_ans4']."</td>";
	echo "</tr>";
	
	if ($row['a_ans5'] != ""){
	
	echo "<tr>";
	echo "<td align='left'>"."<input type='radio' name='choice[{$row["q_id"]}]' value='5'  />"." จ. ".$row['a_ans5']."</td>";
	echo "</tr>";
	
	}
	
	$i++;
	
	echo "</table>";
	
	}

?>

<br>
<div align="center"><input type="submit" value="ส่งข้อสอบ" name="submit" class="btn btn-primary"></div>


<input name="idcard" type="hidden" value="<?=$idcard;?>" />
<input name="perfix" type="hidden" value="<?=$perfix;?>" />
<input name="name" type="hidden" value="<?=$name;?>" />
<input name="department" type="hidden" value="<?=$department;?>" />