eacher" aria-selected="false">By teacher</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" id="byStudentGroupTab" data-toggle="tab" href="#byStudentGroup" role="tab" aria-controls="byStudentGroup" aria-selected="false">By student group</a>
                </li>
            </ul>
        </div>
    </div>
    <div class="tab-content mb-4" id="myTabContent">
        <div class="tab-pane fade show active" id="byRoomPanel" role="tabpanel" aria-labelledby="by