Form submits default value instead of inserted value.

Good day all,
Please could anyone help me with why this form submit only the default values; zeros 0,0.... for any entry?

function my_module_menu($may_cache) {
  $items = array();
  $items['my_module/form'] = array(
    'title' => t('My form'),
    'page callback' => 'my_module_form',
    'access arguments' => array('access content'),
    'description' => t('My form'),
    'type' => MENU_CALLBACK,
  );
  return $items;
}

function my_module_form() {
  return drupal_get_form('my_module_my_form');
}

function my_module_my_form($form_state) {
  $form['name'] = array(
    '#type' => 'fieldset',
    '#title' => t('Name'),
    '#collapsible' => TRUE,
    '#collapsed' =>true,
  );
$form['name']['first']=array(
'#type'=>'textfield',
'#title'=>t('sn'),
'#size'=>56,

);
$form['name']['second']=array(
'#type'=>'textfield',
'#title'=>t('name'),
'#size'=>64,

);

 function my_module_my_form_submit($form_id, $form_values){
 $sn=$form_values['sn'];
 $name=$form_values['name'];

db_query("INSERT INTO {test} (sn,name) VALUES ('%d', '%d')") ;
drupal_set_message(t('your data is saved'));}

     $form['submit']=array(
    '#type' => 'submit',
    '#value' => 'Submit',
      );



  return $form;
  }

Thank you. But I think we should not be late in learning. Please refer me to the point where the case is closed.