form submission in Drupal
I think the easiest way to do this would be to make the key the same as the value.  For instance:

$form['education'] = array(
  '#title' =&gt; t('Education'),
  '#type' =&gt; 'select',
  '#description' =&gt; 'Select your higher education.',
  '#options' =&gt; array(
    '_none' =&gt; t('-- SELECT --'),
    'B.tech' =&gt; t('B.tech'),
    'MCA' =&gt; t('MCA'),
    'MBA' =&gt; t('MBA'),
    'Graduate' =&gt; t('Graduate')
  ),
  '#required' =&gt; TRUE,
);


You need to pass values in associative array