diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..48f823a
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,9 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_file = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
diff --git a/ennead/app.py b/ennead/app.py
index 2c17a27..6b73f3a 100644
--- a/ennead/app.py
+++ b/ennead/app.py
@@ -6,11 +6,12 @@
 
 from ennead.config import Config
 
+from ennead.views.file import upload_file, uploaded_file, files_page
 from ennead.views.auth import register, register_page, login, login_page, logout
 from ennead.views.tasks import index
-from ennead.views.admin import adm_task_list_page, task_edit_page, task_edit, task_delete
 from ennead.views.system import render_markdown_endpoint
-from ennead.views.file import upload_file, uploaded_file, files_page
+from ennead.views.admin import (adm_task_list_page, add_task_set, choose_task_set,
+                                task_edit_page, task_edit, task_delete)
 
 from ennead.models.base import database
 from ennead.models.file import File
@@ -63,6 +64,9 @@ def create_app(config_path: Optional[str] = None) -> Flask:
     app.add_url_rule('/login', 'login', login, methods=['POST'])
     app.add_url_rule('/logout', 'logout', logout)
 
+    app.add_url_rule('/adm/task_set', 'add_task_set', add_task_set, methods=['POST'])
+    app.add_url_rule('/adm/task_set/choose', 'choose_task_set', choose_task_set, methods=['POST'])
+
     app.add_url_rule('/adm/tasks', 'adm_task_list_page', adm_task_list_page)
     app.add_url_rule('/adm/tasks/<int:task_id>', 'task_edit_page', task_edit_page)
     app.add_url_rule('/adm/tasks', 'task_edit', task_edit, methods=['POST'])
diff --git a/ennead/templates/adm_task_list.html b/ennead/templates/adm_task_list.html
index e188ef9..c95f489 100644
--- a/ennead/templates/adm_task_list.html
+++ b/ennead/templates/adm_task_list.html
@@ -2,25 +2,68 @@
 
 {% block title %}Редактирование задач{% endblock %}
 
+{% set current_task_set = task_set %}
+
+{% block head %}
+    <script>
+        window.addEventListener('load', function() {
+            var taskSetSelector = document.getElementById('task_set_selector');
+            taskSetSelector.addEventListener('change', function() {
+                window.location.href = '?task_set=' + taskSetSelector.value;
+            });
+        });
+    </script>
+{% endblock %}
+
 {% block body %}
-    <h2>Задачи {{task_set.name}}</h2>
-    {% for task in task_set.tasks %}
-        <div class="card mb-3">
-            <div class="card-body">
-                <div class="card-title">
-                    <h3>
-                        {{task.name}}
-                    </h3>
+    <div class="mt-2 mb-3">
+        <form method="POST" action="{{url_for('choose_task_set')}}">
+            <div class="form-row mb-2 mr-0">
+                <div class="col-md-10">
+                    <select id="task_set_selector" name="task_set" class="custom-select">
+                        {% for task_set in task_set_list %}
+                            <option value="{{task_set.id}}"
+                                {% if task_set.id == current_task_set.id %}selected{% endif %}>
+                                {{task_set.name}}
+                            </option>
+                        {% endfor %}
+                    </select>
                 </div>
-                <div class="card-text text-muted">
-                    Баллы: {{task.base_score}}
+                <input
+                    type="submit"
+                    class="btn btn-primary col-md-2"
+                    value="Сделать активным"
+                    {% if task_set.active %}disabled{% endif %}>
+            </div>
+        </form>
+        <form method="POST" action="{{url_for('add_task_set')}}">
+            <div class="form-row mr-0">
+                <div class="col-md-10">
+                    <input name="name" id="name" class="form-control">
+                </div>
+                <input type="submit" class="btn btn-primary col-md-2" value="Добавить набор задач">
+            </div>
+        </form>
+    </div>
+    {% if task_set %}
+        {% for task in task_set.tasks %}
+            <div class="card mb-2">
+                <div class="card-body">
+                    <div class="card-title">
+                        <h3>
+                            {{task.name}}
+                        </h3>
+                    </div>
+                    <div class="card-text text-muted">
+                        Баллы: {{task.base_score}}
+                    </div>
+                    <a href="{{url_for('task_edit_page', task_id=task.id)}}">
+                        Редактировать
+                    </a>
                 </div>
-                <a href="{{url_for('task_edit_page', task_id=task.id)}}">
-                    Редактировать
-                </a>
             </div>
-        </div>
-    {% endfor %}
-    <h2>Добавить задачу</h2>
-    {% include 'task_edit_form.html' %}
+        {% endfor %}
+        <h2>Добавить задачу</h2>
+        {% include 'task_edit_form.html' %}
+    {% endif %}
 {% endblock %}
diff --git a/ennead/views/admin.py b/ennead/views/admin.py
index 2d61903..71806b2 100644
--- a/ennead/views/admin.py
+++ b/ennead/views/admin.py
@@ -1,9 +1,14 @@
 """Views, used for task creation and editing"""
 
+from typing import Any, Dict
+
 from flask import abort, redirect, render_template, request, url_for
 from werkzeug.wrappers import Response
 
+from peewee import PeeweeException
+
 from ennead.utils import require_teacher
+from ennead.models.base import database
 from ennead.models.task import Task, TaskSet
 
 
@@ -11,7 +16,20 @@
 def adm_task_list_page() -> Response:
     """GET /adm/tasks: list of tasks & creation of new"""
 
-    return render_template('adm_task_list.html', task_set=TaskSet.get(active=True))
+    task_set = None
+    task_set_criterion: Dict[str, Any] = {'active': True}
+    task_set_id = request.args.get('task_set')
+    if isinstance(task_set_id, (str, int)):
+        try:
+            task_set_criterion = {'id': int(task_set_id)}
+        except (TypeError, ValueError):
+            abort(400)
+    try:
+        task_set = TaskSet.get(**task_set_criterion)
+    except TaskSet.DoesNotExist:
+        pass
+
+    return render_template('adm_task_list.html', task_set=task_set, task_set_list=TaskSet.select())
 
 
 @require_teacher
@@ -62,3 +80,49 @@ def task_delete(task_id: int) -> Response:
 
     Task.delete().where(Task.id == task_id).execute()
     return redirect(url_for('adm_task_list_page'))
+
+
+@require_teacher
+def add_task_set() -> Response:
+    """POST /adm/task_set: add a new task set"""
+
+    if 'name' not in request.form:
+        abort(400)
+
+    task_set = TaskSet()
+    task_set.name = request.form['name']
+    task_set.active = True
+
+    with database.atomic() as transaction:
+        try:
+            TaskSet.update({TaskSet.active: False}).execute(database)
+            task_set.save()
+        except PeeweeException:
+            transaction.rollback()
+            abort(500)
+
+    return redirect(url_for('adm_task_list_page'))
+
+
+@require_teacher
+def choose_task_set() -> Response:
+    """"POST /adm/task_set/choose: select active task set"""
+
+    if 'task_set' not in request.form:
+        abort(400)
+
+    try:
+        task_set = TaskSet.get_by_id(int(request.form['task_set']))
+    except (ValueError, TypeError, TaskSet.DoesNotExist):
+        abort(400)
+
+    task_set.active = True
+    with database.atomic() as transaction:
+        try:
+            TaskSet.update({TaskSet.active: False}).execute(database)
+            task_set.save()
+        except PeeweeException:
+            transaction.rollback()
+            abort(500)
+
+    return redirect(url_for('adm_task_list_page'))