Sum Speific Row Value in a table in Select All Condition

I am trying to sum the value of selected checkbox in a table. it works well when i selected the row value indivially but when i check select all checkbox it sum the whole column instead of one specific row value.

My code:

Javascript:

                $(document).ready(function()
                {
                $("#selectAll").click(function()               
                {
                var checked_status = this.checked;
                var ntot = 0;
                $("input[id=P102]").each(function() //i used column value here.
                 i want to use row value
                {
                if (checked_status) ntot += parseInt($(this).val());
                this.checked = checked_status;
                });
                $("#total").val(ntot);
                });                   
                });
                $(document).ready(function() {
                function updateSum() {
                var total = 0;
                $(".sum:checked").each(function(i, n) {total += parseInt($(n).val());})
                $("#total").val(total);
                }
                $("input.sum").change(updateSum);
                updateSum();
                });
                function SelectAll(obj) {
                var table = $(obj).closest('table');
                var th_s = table.find('th');
                var current_th = $(obj).closest('th');
                var columnIndex = th_s.index(current_th)-2;
                console.log('The Column is = ' + columnIndex);
                table.find('td:nth-child('+(columnIndex)+') input').prop("checked",obj.checked);
                }

HTML:

                   <div class="container">
                   <div class="row">
                   <div class="col-md-2">
                      <?php
                       $i=1;
                      $sql="select colStudentNameEnglish from 
                     `tbl_newstudentregistration` 
                    where EXTRACT(YEAR FROM colRegisteredDate)= 2015";
                    
                    $result = mysql_query($sql) or die(mysql_error()); 
                    $data=array();
                    ?>
                 <style>
                    table, th, td {
                    border: 1px solid black;
                    padding: 5px;
                    }
                    table {
                    border-spacing: 15px;
                    }
                    th[colspan="11"] {
                    text-align: center;
                    }
                 </style>
                 <table style="width:100%;">
                 <tr align="center" >
                    <th style="padding:2.5px; width: 10%;" rowspan="2">S.NO</th>
                    <th style="padding:2.5px; width: 55%;" rowspan="2">StudentID</th>
                    <th style="padding:2.5px;" colspan="5" style="text-align:center;">subject</th>
                    <th style="padding:2.5px;" rowspan="2">Sum</th>
                 </tr>
                 <tr>
                    <th>s1 <input type="checkbox" id="selectAll" onclick="SelectAll(this)" /></th>
                    <th>s2 <input type="checkbox" id="selectAll" onclick="SelectAll(this)"/></th>
                    <th>s3 <input type="checkbox" id="selectAll"onclick="SelectAll(this)" /></th>
                    <th>s4 <input type="checkbox" id="selectAll" onclick="SelectAll(this)" /></th>
                    <th>s5 <input type="checkbox" id="selectAll" onclick="SelectAll(this)"/></th>
                 </tr>
                 <li>
                    <?php
                       while ($row = mysql_fetch_array($result)){
                        
                       //$row = mysql_fetch_assoc($result); 
                       $data[]=$row['colStudentNameEnglish'];
                       $number=$row['colStudentNameEnglish'];
                       $_SESSION['Roll']=$number;
                       $str = implode("\n", $data);
                       $_SESSION['value']=$number;
                       $_SESSION['url']="index.php?StudentID=$number";
                       ?>
                    <?php
                       ?>
                    <tr>
                       <td><?php echo $i; ?></td>
                       <td><a href="#" data-id='<?php echo $number; ?>' class="link" id="link">  
                          <?php
                             echo  "$number";
                              
                             
                             ?>
                 </li>
                 </a></td>
                 <td><input type="checkbox" name="checkbox" id="P102" 
                 class="sum" value="10" data-toggle="checkbox"><br></td>
                 <td><input type="checkbox" name="checkbox" id="P202" 
                 class="sum" value="10" data-toggle="checkbox"><br></td>
                 <td><input type="checkbox" name="checkbox" id="C031" 
                 class="sum" value="10" data-toggle="checkbox"><br></td>
                 <td><input type="checkbox" name="checkbox" id="P104" 
                  class="sum" value="10" data-toggle="checkbox"><br></td>
                 <td><input type="checkbox" name="checkbox" id="P204" 
                  class="sum" value="10" data-toggle="checkbox"><br></td>
                 <td><input  type="text" id="total"><br></td>
                 </tr>
                </div>
                <?php $i=$i+1; }?>
               </div>
               </div>

If SelectAll checkbox is checked,i want to add each row sum to each textfield (as 10 in Image) AnyBody Help Me to Solve this issue???

Thanks in Advance...