Need data from two different actions

Try

$globalres="";

add_action('quiz_completed', 'mi_ld_quiz_ert', 10, 2);
function mi_ld_quiz_ert( $quizdata, $current_user ) {
  global $globalres;
  if($globalres== 0){
    do_action('ld_update_group_access', $current_user, 2, $remove = false     ));
  }
  else{
    do_action('ld_update_group_access', $current_user, 14, $remove = false ));
   }
}

add_action('learndash_ques_single_answer_correct', 'my_ld_quiz_resp',5,5);
function my_ld_quiz_resp(  $answerIndex, $correctAnswer, $userResponse) {
  global $globalres;
  $globalres = $answerIndex; 
}