Hello All,
From the given blog below you will get to know about redirection of any form after submission or custom $form_state['redirect] in drupal 7:-

First you need to override form_alter by usind drupal hook function hook_form_alter. To change the form_state['redirect],put this code in your hook_form_alter like this:-

function MODULENAME_form_alter(&$form, &$form_state, $form_id){
    switch ($form_id) {
      case 'application_node_form':
          $nodeId = '';
          $nodeId = $form['nid']['#value'];
          if(empty($nodeId)){
            $form['actions']['submit']['#submit'][] = '_application_form_submit';
          }
        break;

      default:
        # code...
        break;
    }

}

Then write code in your form submit handler:-

function _application_form_submit($form, &$form_state){
    $form_state['redirect'] = 'confirmation-page';
}

Please note: you need to use $form['actions]['submit']['#submit'][] instead of $form['#submit'].