ผมจะเอาค่าที่มันวนลูปมาบวกกันยังไงครับลองทำดูแล้วมันไม่ได้

<?
include('config.php');
$erid=$_GET[check];
$s=$_GET[xxx1];
$ex=$_GET[xxx2];
$c='';
//echo "$s $ex</br>";
$sql = "select * from exam_results as er , exam_news as en where er.s_id='$s' and er.ex_id='$ex' and en.id='$ex' and er.questionnum=en.questionnum and c1='$c'";
$objQuery = mysql_query($sql); 
$num=mysql_num_rows($objQuery);
//$objResult = mysql_fetch_array($objQuery);
 echo $num;
?>
<form id="form1" name="form1" method="post" action="exam-check-select-save.php">
<?
for($i=1;$i<=$num;$i++)
{
while($objResult = mysql_fetch_array($objQuery))
{
?>        		
<table width="70%" cellpadding="0" cellspacing="0">
<tr>
            <td width="9%" align="right" valign="top" scope="col">คำถาม <?=$objResult["er_id"];?></td>
		    <td width="38%" align="left" valign="top" scope="col">&nbsp;&nbsp;&nbsp;<?=$objResult["question"];?></td>
		    <td width="25%" scope="col">คำตอบของนักศึกษา</td>
		    <td width="33%" scope="col"><?=$objResult["answers"];?></td>
		  </tr>
          <tr>
             <td valign="top" scope="col" align="right">เฉลย </td>
		    <td valign="top" scope="col" align="left">&nbsp;&nbsp;&nbsp;<?=$objResult["answer"];?></td>
            <td colspan="2" align="center" valign="middle" scope="col">คะแนนที่ได้ 
              <label>
              <input type="text" name="scores<?=$i;?>" id="scores" />
            คะแนน</label></td>
          </tr>
          <tr>
            <td colspan="3"  scope="col">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;คะแนน <?=$objResult["scoren"];?> คะแนน
            </LABEL></td>
            <td scope="col">&nbsp;</td>
          </tr>
          <tr>
            <td colspan="4" align="right" valign="top" scope="col">——————————————————————————————————————————   </td>
              <input name="edit_id" type="hidden" id="edit_id" value="<?=$_REQUEST['xxx1']?>" />
              <input name="num1" type="hidden" id="num1" value="<?=$_REQUEST['xxx2']?>" />
              <input name="num" type="hidden" id="num" value="<?=$num;?>" />
			  <input name="er_id<?=$i;?>" type="hidden" id="er_id" value="<?=$objResult["er_id"];?>" />
              <input type="hidden" name="hdnLine" value="<?=$i;?>">
              <input name="scoren<?=$i;?>" type="hidden" id="scoren" value="<?=$objResult["scoren"];?>" />
          </tr>
		  <?
		  $i++;}}
		  ?>
          </table>
          <center><input id="submit" value="บันทึก" type="submit" name="submit2" /></center>
          </form>

<?
include('config.php');
$n=$_POST[num];
echo "n = $n</br>";
$n1=$_REQUEST["edit_id"];
$n2=$_REQUEST["num1"];
echo "$n1</br> $n2 </br>";
for($i=0; $i<=$n;$i++)
{
echo "X$i =".$_POST["scores$i"]."คะแนนที่ได้,".$_POST["scoren$i"]."คำถาม</br>";
        if($_POST["scores$i"] != "")
        {
$strSQL = "UPDATE exam_results SET score='".$_POST["scores$i"]."' WHERE er_id=".$_POST["er_id$i"]."";
$sqll=mysql_query($strSQL ) or die (mysql_error());
//echo "$sqll ><</br>";
        }
   
	 }	$scoretotals=0;
	 $scoretotal=$scoretotals+$_POST["scores$i"];
	 echo "scoretotal=$scoretotal</br>";
//echo "<meta Http-equiv=\"refresh\" Content=\"2; Url=../project2/exam-check.php?id=$n1\">";
?>