How to Hide Online Marksheet Creator : eMarksheet Admin Menus

function plt_hide_emarksheet_menus() {
	//Hide "eMarksheet".
	remove_menu_page('eMarksheet-main');
	//Hide "eMarksheet → Add Class".
	remove_submenu_page('eMarksheet-main', 'eMarksheet-main');
	//Hide "eMarksheet → Add Subject".
	remove_submenu_page('eMarksheet-main', 'eMarksheet-subject');
	//Hide "eMarksheet → Enroll Student".
	remove_submenu_page('eMarksheet-main', 'eMarksheet-student');
	//Hide "eMarksheet → Students List".
	remove_submenu_page('eMarksheet-main', 'eMarksheet-student-list');
	//Hide "eMarksheet → Add Marks".
	remove_submenu_page('eMarksheet-main', 'eMarksheet-add-marks');
	//Hide "eMarksheet → Settings".
	remove_submenu_page('eMarksheet-main', 'eMarksheet-settings');
	//Hide "eMarksheet → Print Marksheet".
	remove_submenu_page('eMarksheet-main', 'eMarksheet-print');
	//Hide "eMarksheet → Help & Support".
	remove_submenu_page('eMarksheet-main', 'eMarksheet-help');
	//Hide "eMarksheet → Un-Install".
	remove_submenu_page('eMarksheet-main', 'eMarksheet-remove');
}

add_action('admin_menu', 'plt_hide_emarksheet_menus', 11);
Where do I put this code?