diff --git a/index.php b/index.php
index 8e53aa3..1a1793a 100644
--- a/index.php
+++ b/index.php
@@ -150,6 +150,7 @@ if($_SESSION[Student_ID] != ""){
                 echo "<div class=\"input-field col s12\" style=\"height:1px;overflow:hidden\"><input value=\"".$random."\" type=\"text\" class=\"validate\" style=\"color:#fff\" name=\"question_".$i."\"></div>\n";
               }
               if($flag == 0){
+                $randomArray[$i]++;
                 $i--;
                 sleep(0.4);
               }
diff --git a/testdb.php b/testdb.php
deleted file mode 100644
index 3c5b9a0..0000000
--- a/testdb.php
+++ /dev/null
@@ -1,58 +0,0 @@
-<?php
-            //link to mysql
-            $con=mysqli_connect("127.0.0.1:3306","buptStudent","buptStudentlx","buptStudentdb");
-            if (!$con){die('Could not connect:' . mysql_error());};
-            //mysql_select_db("my_db_test", $con);
-            $p = 20;
-            $pp = 0;
-            $ppp = $p + $pp;//the number of questions
-            echo "<div id=\"ppp\" ppp=\"".$ppp."\"></div>\n<div class=\"section\" id=\"hiddenBefore\"><h5>&nbsp;&nbsp;单选题</h5>\n";
-            //创建随机数组
-            $randomArray = array_rand(range(1,99),$p+1);
-            // for($i = 1;$i <= $p;$i++){
-            //   echo $randomArray[$i]."  ";
-            // }
-            shuffle($randomArray);
-            for($i = 1;$i <= $p;$i++){
-              $flag = 0;
-              $random = $randomArray[$i];
-              $result = mysqli_query($con,"SELECT * FROM Persons WHERE num='$random'");
-              while($row = mysqli_fetch_array($result)){
-              //html
-                $flag = 1;
-                echo "<div class=\"spbq\" name=\"div_e\"><div class=\"biankuang biankuang_1\"></div><div class=\"biankuang biankuang_2\"></div><div class=\"biankuang biankuang_3\"></div><div class=\"biankuang biankuang_4\"></div>";
-                echo "<h6 id=\"question_".$i."\">". $i. ".". $row['q'] ."</h6>\n<p>";
-                echo "<input class=\"with-gap\" type=\"radio\" name=\"answer_". $i. "\" value=\"1\" id=\"test". $i. "1\" onclick=\"addOne(this)\"/>\n<label for=\"test". $i. "1\">". $row['A'] ."</label>\n";
-                echo "<input class=\"with-gap\" type=\"radio\" name=\"answer_". $i. "\" value=\"2\" id=\"test". $i. "2\" onclick=\"addOne(this)\"/>\n<label for=\"test". $i. "2\">". $row['B'] ."</label>\n";
-                echo "<input class=\"with-gap\" type=\"radio\" name=\"answer_". $i. "\" value=\"3\" id=\"test". $i. "3\" onclick=\"addOne(this)\"/>\n<label for=\"test". $i. "3\">". $row['C'] ."</label>\n";
-                if($row['D']){
-                  echo "<input class=\"with-gap\" type=\"radio\" name=\"answer_". $i. "\" value=\"4\" id=\"test". $i. "4\" onclick=\"addOne(this)\"/>\n<label for=\"test". $i. "4\">". $row['D'] ."</label>\n";
-                }
-                echo "</p></div>\n";
-                echo "<div class=\"input-field col s12\" style=\"height:1px;overflow:hidden\"><input value=\"".$random."\" type=\"text\" class=\"validate\" style=\"color:#fff\" name=\"question_".$i."\"></div>\n";
-              }
-              if($flag == 0){
-                $randomArray[$i]++;
-                $i--;
-                sleep(0.4);
-              }
-            }
-
-            // echo "<!-- </div><div class=\"section\"> --><h5>&nbsp;&nbsp;二、判断题</h5>";
-            // $randomArray = range(1,10);
-            // shuffle($randomArray);
-            // for($i = 1;$i <= $pp;$i++){
-            //   $random = $randomArray[$i] + 60;
-            //   $result = mysqli_query($con,"SELECT q FROM Persons WHERE num='$random'");
-            //   while($row = mysqli_fetch_array($result)){
-            //     $j = $i + $p;
-            //     //echo "<p>".$row."</p>";
-            //     echo "<div class=\"spbq\" name=\"div_e\"><div class=\"biankuang biankuang_1\"></div><div class=\"biankuang biankuang_2\"></div><div class=\"biankuang biankuang_3\"></div><div class=\"biankuang biankuang_4\"></div><h6 id=\"question_".$j."\">". $j. ".". $row['q'] ."</h6>\n<p><input class=\"with-gap\" type=\"radio\" name=\"answer_". $j. "\" value=\"1\" id=\"test". $j. "1\" onclick=\"addOne(this)\"/>\n<label for=\"test". $j. "1\">正确</label>\n<input class=\"with-gap\" type=\"radio\" name=\"answer_". $j. "\" value=\"2\" id=\"test". $j. "2\" onclick=\"addOne(this)\"/>\n<label for=\"test". $j. "2\">错误</label>\n</p></div>\n";
-            //     echo "<div class=\"input-field col s12\" style=\"height:1px;overflow:hidden\"><input value=\"".$random."\" type=\"text\" class=\"validate\" style=\"color:#fff\" name=\"question_".$j."\"></div>\n";
-            //   }
-            // }
-
-            echo "</div>";
-            //close linking
-            mysqli_close($con);
-            ?>
\ No newline at end of file