diff --git a/app/Models/Category.php b/app/Models/Category.php
new file mode 100644
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--- /dev/null
+++ b/app/Models/Category.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class Category extends Model
+{
+    use SoftDeletes;
+
+    protected $table = 'se_categories';
+
+    protected $fillable = [
+        'content',
+        'content_vi',
+        'description',
+        'status',
+    ];
+
+    public function exercises()
+    {
+        return $this->hasMany(Exercise::class, 'category_id');
+    }
+}
diff --git a/app/Models/Exercise.php b/app/Models/Exercise.php
new file mode 100644
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--- /dev/null
+++ b/app/Models/Exercise.php
@@ -0,0 +1,50 @@
+<?php
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class Exercise extends Model
+{
+    use SoftDeletes;
+
+    protected $table = 'se_exercises';
+
+    protected $fillable = [
+        'subject_id',
+        'lesson_name',
+        'description',
+        'level',
+        'avatar',
+        'status',
+        'category_id',
+        'skill_id',
+        'year',
+        'media_object_id',
+    ];
+
+    public function subject()
+    {
+        return $this->belongsTo(Subject::class, 'subject_id');
+    }
+
+    public function category()
+    {
+        return $this->belongsTo(Category::class, 'category_id');
+    }
+
+    public function skill()
+    {
+        return $this->belongsTo(Skill::class, 'skill_id');
+    }
+
+    public function questionGroups()
+    {
+        return $this->hasMany(QuestionGroup::class, 'exercise_id');
+    }
+
+    public function questions()
+    {
+        return $this->hasMany(Question::class, 'exercise_id');
+    }
+}
diff --git a/app/Models/ExerciseQuestion.php b/app/Models/ExerciseQuestion.php
new file mode 100644
index 0000000..e83becb
--- /dev/null
+++ b/app/Models/ExerciseQuestion.php
@@ -0,0 +1,18 @@
+<?php
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class ExerciseQuestion extends Model
+{
+    use SoftDeletes;
+
+    protected $table = 'se_exercise_questions';
+
+    protected $fillable = [
+        'exercise_id',
+        'question_id',
+        'position',
+    ];
+}
diff --git a/app/Models/Media.php b/app/Models/Media.php
new file mode 100644
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--- /dev/null
+++ b/app/Models/Media.php
@@ -0,0 +1,23 @@
+<?php
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class Media extends Model
+{
+    use SoftDeletes;
+
+    protected $table = 'se_media';
+
+    protected $fillable = [
+        'object_id',
+        'file_name',
+        'file_url',
+        'mime_type',
+        'size_bytes',
+        'position',
+    ];
+
+    // Gợi ý: nếu cần polymorphic, bạn sẽ thay bằng morphTo()
+}
diff --git a/app/Models/Question.php b/app/Models/Question.php
new file mode 100644
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--- /dev/null
+++ b/app/Models/Question.php
@@ -0,0 +1,51 @@
+<?php
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class Question extends Model
+{
+    use SoftDeletes;
+
+    protected $table = 'se_questions';
+
+    protected $fillable = [
+        'exercise_id',
+        'content',
+        'description',
+        'group_id',
+        'question_type_id',
+        'level',
+        'score',
+        'answer',
+        'explanation',
+        'hint',
+        'media_object_id',
+    ];
+
+    public function exercise()
+    {
+        return $this->belongsTo(Exercise::class, 'exercise_id');
+    }
+
+    public function group()
+    {
+        return $this->belongsTo(QuestionGroup::class, 'group_id');
+    }
+
+    public function type()
+    {
+        return $this->belongsTo(QuestionType::class, 'question_type_id');
+    }
+
+    public function choices()
+    {
+        return $this->hasMany(QuestionChoice::class, 'question_id');
+    }
+
+    public function blanks()
+    {
+        return $this->hasMany(QuestionBlank::class, 'question_id');
+    }
+}
diff --git a/app/Models/QuestionBlank.php b/app/Models/QuestionBlank.php
new file mode 100644
index 0000000..235ad61
--- /dev/null
+++ b/app/Models/QuestionBlank.php
@@ -0,0 +1,24 @@
+<?php
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class QuestionBlank extends Model
+{
+    use SoftDeletes;
+
+    protected $table = 'se_question_blanks';
+
+    protected $fillable = [
+        'question_id',
+        'position',
+        'correct_answer',
+        'other_answers',
+    ];
+
+    public function question()
+    {
+        return $this->belongsTo(Question::class, 'question_id');
+    }
+}
diff --git a/app/Models/QuestionChoice.php b/app/Models/QuestionChoice.php
new file mode 100644
index 0000000..a96d9f1
--- /dev/null
+++ b/app/Models/QuestionChoice.php
@@ -0,0 +1,27 @@
+<?php
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class QuestionChoice extends Model
+{
+    use SoftDeletes;
+
+    protected $table = 'se_question_choices';
+
+    protected $fillable = [
+        'question_id',
+        'label',
+        'content',
+        'is_correct',
+        'media',
+        'media_object_id',
+        'position',
+    ];
+
+    public function question()
+    {
+        return $this->belongsTo(Question::class, 'question_id');
+    }
+}
diff --git a/app/Models/QuestionGroup.php b/app/Models/QuestionGroup.php
new file mode 100644
index 0000000..5f20cd5
--- /dev/null
+++ b/app/Models/QuestionGroup.php
@@ -0,0 +1,33 @@
+<?php
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class QuestionGroup extends Model
+{
+    use SoftDeletes;
+
+    protected $table = 'se_question_groups';
+
+    protected $fillable = [
+        'content',
+        'content_vi',
+        'exercise_id',
+        'is_question_order_fixed',
+        'is_option_order_fixed',
+        'position',
+        'paragraph',
+        'media_object_id',
+    ];
+
+    public function exercise()
+    {
+        return $this->belongsTo(Exercise::class, 'exercise_id');
+    }
+
+    public function questions()
+    {
+        return $this->hasMany(Question::class, 'group_id');
+    }
+}
diff --git a/app/Models/QuestionType.php b/app/Models/QuestionType.php
new file mode 100644
index 0000000..124e3d7
--- /dev/null
+++ b/app/Models/QuestionType.php
@@ -0,0 +1,24 @@
+<?php
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class QuestionType extends Model
+{
+    use SoftDeletes;
+
+    protected $table = 'se_question_types';
+
+    protected $fillable = [
+        'name',
+        'code',
+        'description',
+        'status',
+    ];
+
+    public function questions()
+    {
+        return $this->hasMany(Question::class, 'question_type_id');
+    }
+}
diff --git a/app/Models/Skill.php b/app/Models/Skill.php
new file mode 100644
index 0000000..fbdf0ee
--- /dev/null
+++ b/app/Models/Skill.php
@@ -0,0 +1,23 @@
+<?php
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class Skill extends Model
+{
+    use SoftDeletes;
+
+    protected $table = 'se_skills';
+
+    protected $fillable = [
+        'name',
+        'code',
+        'description',
+    ];
+
+    public function exercises()
+    {
+        return $this->hasMany(Exercise::class, 'skill_id');
+    }
+}
diff --git a/app/Models/Subject.php b/app/Models/Subject.php
new file mode 100644
index 0000000..44c8f7f
--- /dev/null
+++ b/app/Models/Subject.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Subject extends Model
+{
+    //
+}