how to post values in a row of particular table to other php page

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PHP

table

data

I want to update marks of a particular student in particular subject out of eight subjects. please inspect the following code.

echo 'Marks Details of  '.$id.'   in  '.$semester.'  semester'.'<br>';
$query='SELECT subname,marks
FROM `2-1subjects`
JOIN `2-1`
ON `2-1subjects`.subcode=`2-1`.subcode
WHERE id='."'".$id."'";
    
$sql=mysql_query($query);
if(!$sql)
{
  die('invalid Query:'.mysql_error());
}
Print "<table border=0 cellpadding=10>";
Print "<th>SUBJECT NAME</th>";
Print "<th>MARKS</th>";
while($row = mysql_fetch_array($sql))
{
 Print "<tr>";
 print "<td>".$row['subname'] . "</td> ";
    
                                      ?>
    
                                      <td> <input type="text" style="text-align:center" value="<?php echo $row['marks'] ?>" /></td>
                                       <?php
                                      Print "</tr>";
                                             }
                                      Print "</table>";
                                        ?>
                                      <form method="POST" action="2-1marks_update.php" >
                                      <input type="submit" name="submit" value="Update Marks"/>';
                                      </form>
                                      <?php

and the below two are my 2-1 and 2-1subjects tables respectively. here 'id' and 'subcode' are primary keys.

  id       subcode     marks
   10kp1a1201  2-1sub#5    80
   10kp1a1201  2-1sub#4    70
   10kp1a1201  2-1sub#3    60
   10kp1a1201  2-1sub#2    50
   10kp1a1201  2-1sub#1    40
   10kp1a1201  2-1sub#6    90
   10kp1a1201  2-1sub#7    100
   10kp1a1201  2-1sub#8    80

subcode   subname credits
  2-1sub#1     s1  4
   2-1sub#2    s2  2
   2-1sub#3    s3  2
   2-1sub#4    s4  4
   2-1sub#5    s5  2
   2-1sub#6    s6  4
   2-1sub#7    s7  2
   2-1sub#8    s8  2

my question is since i have retrieved 'subname' and respective 'marks' in a table as shown in the above code using the same textbox in a while loop. Now i want to update 2 or 3 subjects according to the context. then how the modified marks along with subject name opposite to it in a table row are passed to another page.

How can i get the subjectname and value of the marks in the textbox from the retrieved table row , such that the updation tesk is depends on this (subname, marks) pair.

please help me. any answer is appreciable. Help me.