diff --git a/app/Filament/Resources/System/ExamResource.php b/app/Filament/Resources/System/ExamResource.php
index cb806c00..31d551e4 100644
--- a/app/Filament/Resources/System/ExamResource.php
+++ b/app/Filament/Resources/System/ExamResource.php
@@ -56,10 +56,12 @@ class ExamResource extends Resource
                         ->reactive()
                     ,
                     Forms\Components\TextInput::make('success_reward_bonus')
+                        ->required()
                         ->label(__('exam.success_reward_bonus'))
                         ->hidden(fn (\Closure $get) => $get('type') != Exam::TYPE_TASK)
                     ,
                     Forms\Components\TextInput::make('fail_deduct_bonus')
+                        ->required()
                         ->label(__('exam.fail_deduct_bonus'))
                         ->hidden(fn (\Closure $get) => $get('type') != Exam::TYPE_TASK)
                     ,
diff --git a/app/Filament/Resources/System/ExamResource/Pages/CreateExam.php b/app/Filament/Resources/System/ExamResource/Pages/CreateExam.php
index 7fe9e14e..581c3347 100644
--- a/app/Filament/Resources/System/ExamResource/Pages/CreateExam.php
+++ b/app/Filament/Resources/System/ExamResource/Pages/CreateExam.php
@@ -29,6 +29,7 @@ class CreateExam extends CreateRecord
             }
             $this->redirect($this->getResource()::getUrl('index'));
         } catch (\Exception $exception) {
+            do_log($exception->getMessage() . "\n" . $exception->getTraceAsString(), "error");
             $this->notify('danger', $exception->getMessage());
         }
     }
diff --git a/app/Models/Exam.php b/app/Models/Exam.php
index 0333467a..efe820cf 100644
--- a/app/Models/Exam.php
+++ b/app/Models/Exam.php
@@ -165,7 +165,10 @@ class Exam extends NexusModel
         $filter = self::FILTER_USER_CLASS;
         if (!empty($currentFilters[$filter])) {
             $classes = collect(User::$classes)->only($currentFilters[$filter]);
-            $arr[] = sprintf('%s: %s', nexus_trans("exam.filters.$filter"), $classes->pluck('text')->implode(', '));
+            $arr[] = sprintf(
+                '%s: %s',
+                nexus_trans("exam.filters.$filter"), $classes->map(fn ($value, $key) => User::getClassText($key))->implode(', ')
+            );
         }
 
         $filter = self::FILTER_USER_REGISTER_TIME_RANGE;
diff --git a/app/Models/User.php b/app/Models/User.php
index eccddb2a..c064f664 100644
--- a/app/Models/User.php
+++ b/app/Models/User.php
@@ -519,6 +519,11 @@ class User extends Authenticatable implements FilamentUser, HasName
         return $this->belongsToMany(Exam::class, "exam_users", "uid", "exam_id");
     }
 
+    public function onGoingExamAndTasks(): \Illuminate\Database\Eloquent\Relations\BelongsToMany
+    {
+        return $this->examAndTasks()->wherePivot("status", ExamUser::STATUS_NORMAL);
+    }
+
     public function getAvatarAttribute($value)
     {
         if ($value) {
diff --git a/app/Repositories/ExamRepository.php b/app/Repositories/ExamRepository.php
index 27f342f3..037294ba 100644
--- a/app/Repositories/ExamRepository.php
+++ b/app/Repositories/ExamRepository.php
@@ -364,18 +364,30 @@ class ExamRepository extends BaseRepository
         /** @var Exam $exam */
         $exam = Exam::query()->find($examId);
         $user = User::query()->findOrFail($uid);
-        if (Auth::user()->class <= $user->class) {
-            throw new NexusException("No permission !");
+        $locale = $user->locale;
+        $authUserClass = get_user_class();
+        $authUserId = get_user_id();
+        if ($exam->isTypeExam()) {
+            if ($authUserClass <= $user->class) {
+                //exam only can assign by upper class admin
+                throw new NexusException(nexus_trans("nexus.no_permission", [], $locale));
+            }
+        } elseif ($exam->isTypeTask()) {
+            if ($user->id != $authUserId) {
+                //task only can be claimed by self
+                throw new NexusException(nexus_trans('exam.claim_by_yourself_only', [], $locale));
+            }
         }
+
         if (!$this->isExamMatchUser($exam, $user)) {
-            throw new NexusException("Exam: {$exam->id} no match this user.");
+            throw new NexusException(nexus_trans('exam.not_match_target_user', [], $locale));
         }
         if ($user->exams()->where('status', ExamUser::STATUS_NORMAL)->exists()) {
-            throw new NexusException("User: $uid already has exam on the way.");
+            throw new NexusException(nexus_trans('exam.has_other_on_the_way', ['type_text' => $exam->typeText], $locale));
         }
         $exists = $user->exams()->where('exam_id', $exam->id)->exists();
         if ($exists) {
-            throw new NexusException("Exam: {$exam->id} already assign to user: {$user->id}.");
+            throw new NexusException(nexus_trans('exam.claimed_already', [], $locale));
         }
         $data = [
             'exam_id' => $exam->id,
diff --git a/include/constants.php b/include/constants.php
index d7bbfd10..9b6a7a7b 100644
--- a/include/constants.php
+++ b/include/constants.php
@@ -1,6 +1,6 @@
 <?php
 defined('VERSION_NUMBER') || define('VERSION_NUMBER', '1.8.12');
-defined('RELEASE_DATE') || define('RELEASE_DATE', '2024-05-20');
+defined('RELEASE_DATE') || define('RELEASE_DATE', '2024-06-07');
 defined('IN_TRACKER') || define('IN_TRACKER', false);
 defined('PROJECTNAME') || define("PROJECTNAME","NexusPHP");
 defined('NEXUSPHPURL') || define("NEXUSPHPURL","https://nexusphp.org");
diff --git a/public/ajax.php b/public/ajax.php
index e47f7eca..4de9f4f3 100644
--- a/public/ajax.php
+++ b/public/ajax.php
@@ -150,6 +150,13 @@ class AjaxInterface{
         $rep = new \App\Repositories\MedalRepository();
         return $rep->saveUserMedal($CURUSER['id'], $data);
     }
+
+    public static function claimTask($params)
+    {
+        global $CURUSER;
+        $rep = new \App\Repositories\ExamRepository();
+        return $rep->assignToUser($CURUSER['id'], $params['exam_id']);
+    }
 }
 
 $class = 'AjaxInterface';
diff --git a/public/task.php b/public/task.php
index 319197f1..aebf5b4e 100644
--- a/public/task.php
+++ b/public/task.php
@@ -43,18 +43,20 @@ TABLE;
 $now = now();
 $table .= '<tbody>';
 $userInfo = \App\Models\User::query()->findOrFail($CURUSER['id'], \App\Models\User::$commonFields);
-$userTasks = $userInfo->examAndTasks()->where("type", \App\Models\Exam::TYPE_TASK)
+$userTasks = $userInfo->onGoingExamAndTasks()->where("type", \App\Models\Exam::TYPE_TASK)
     ->orderBy('id', 'desc')
     ->get()
     ->keyBy('id')
 ;
-//dd($userTasks);
+//dd(last_query());
 foreach ($rows as $row) {
     $claimDisabled = $claimClass = '';
     $claimBtnText = "认领";
     if ($userTasks->has($row->id)) {
         $claimDisabled = " disabled";
         $claimBtnText = "已认领";
+    } else {
+        $claimClass = "claim";
     }
     $claimAction = sprintf(
         '<input type="button" class="%s" data-id="%s" value="%s"%s>',
@@ -75,15 +77,15 @@ foreach ($rows as $row) {
 $table .= '</tbody></table>';
 echo $header . $table . $paginationBottom;
 end_main_frame();
-$confirmBuyMsg = nexus_trans('medal.confirm_to_buy');
+$confirmBuyMsg = nexus_trans('exam.confirm_to_claim');
 $confirmGiftMsg = nexus_trans('medal.confirm_to_gift');
 $js = <<<JS
-jQuery('.buy').on('click', function (e) {
-    let medalId = jQuery(this).attr('data-id')
+jQuery('.claim').on('click', function (e) {
+    let id = jQuery(this).attr('data-id')
     layer.confirm("{$confirmBuyMsg}", function (index) {
         let params = {
-            action: "buyMedal",
-            params: {medal_id: medalId}
+            action: "claimTask",
+            params: {exam_id: id}
         }
         console.log(params)
         jQuery.post('ajax.php', params, function(response) {
diff --git a/resources/lang/en/exam.php b/resources/lang/en/exam.php
index 9a963f5b..5bca5183 100644
--- a/resources/lang/en/exam.php
+++ b/resources/lang/en/exam.php
@@ -48,4 +48,11 @@ return [
 
     'fail_deduct_bonus' => 'Deduct bonus for task failure',
     'success_reward_bonus' => 'Reward bonus for task completion',
+
+    'action_claim_task' => 'Claim',
+    'confirm_to_claim' => 'Sure you want to claim?' ,
+    'claim_by_yourself_only' => 'Claim only by yourself!' ,
+    'not_match_target_user' => 'You are not a matching target user!' ,
+    'has_other_on_the_way' => 'There is an other :type_text in progress!' ,
+    'claimed_already' => 'Already claimed',
 ];
diff --git a/resources/lang/en/nexus.php b/resources/lang/en/nexus.php
index f9fac3a7..22f359cc 100644
--- a/resources/lang/en/nexus.php
+++ b/resources/lang/en/nexus.php
@@ -16,4 +16,5 @@ return [
     'no_limit' => 'No limit',
     'sum' => 'Sum',
     'do_not_repeat' => 'Please do not repeat the operation!',
+    'no_permission' => 'No permission!',
 ];
diff --git a/resources/lang/zh_CN/exam.php b/resources/lang/zh_CN/exam.php
index 488b3f54..12fe4cbd 100644
--- a/resources/lang/zh_CN/exam.php
+++ b/resources/lang/zh_CN/exam.php
@@ -61,5 +61,9 @@ return [
     'success_reward_bonus' => '任务完成奖励魔力',
 
     'action_claim_task' => '领取',
-
+    'confirm_to_claim' => '确定要认领吗？',
+    'claim_by_yourself_only' => '只能自己认领!',
+    'not_match_target_user' => '你不是匹配的目标用户！',
+    'has_other_on_the_way' => '有其他进行中的:type_text',
+    'claimed_already' => '已经认领',
 ];
diff --git a/resources/lang/zh_CN/nexus.php b/resources/lang/zh_CN/nexus.php
index d92d4e00..44050c35 100644
--- a/resources/lang/zh_CN/nexus.php
+++ b/resources/lang/zh_CN/nexus.php
@@ -16,4 +16,5 @@ return [
     'no_limit' => '不限',
     'sum' => '累计',
     'do_not_repeat' => '请不要重复操作！',
+    'no_permission' => '无权限!',
 ];
diff --git a/resources/lang/zh_TW/exam.php b/resources/lang/zh_TW/exam.php
index c8ad4ec3..b43fb763 100644
--- a/resources/lang/zh_TW/exam.php
+++ b/resources/lang/zh_TW/exam.php
@@ -48,4 +48,11 @@ return [
 
     'fail_deduct_bonus' => '任务失败扣除魔力',
     'success_reward_bonus' => '任务完成奖励魔力',
+
+    'action_claim_task' => '領取',
+    'confirm_to_claim' => '確定要認領嗎？',
+    'claim_by_yourself_only' => '只能自己認領!',
+    'not_match_target_user' => '你不是匹配的目標用戶！',
+    'has_other_on_the_way' => '有其他進行中的:type_text',
+    'claimed_already' => '已經認領',
 ];
diff --git a/resources/lang/zh_TW/nexus.php b/resources/lang/zh_TW/nexus.php
index 921268bd..fe0f7821 100644
--- a/resources/lang/zh_TW/nexus.php
+++ b/resources/lang/zh_TW/nexus.php
@@ -16,4 +16,5 @@ return [
     'no_limit' => '不限',
     'sum' => '累計',
     'do_not_repeat' => '請不要重復操作！',
+    'no_permission' => '無權限!',
 ];