How to Hide Student Result or Employee Database Admin Menus

function plt_hide_simple_student_result_menus() {
	//Hide "Students Result".
	remove_menu_page('SSR');
	//Hide "Students Result → Students Result".
	remove_submenu_page('SSR', 'SSR');
	//Hide "Students Result → All Student".
	remove_submenu_page('SSR', 'ssr_all_entires');
	//Hide "Students Result → Add/Edit Student".
	remove_submenu_page('SSR', 'ssr_add_results');
	//Hide "Students Result → View CGPA".
	remove_submenu_page('SSR', 'edit.php?post_type=ssr_cgpa');
	//Hide "Students Result → Add CGPA".
	remove_submenu_page('SSR', 'post-new.php?post_type=ssr_cgpa');
	//Hide "Students Result → Subject".
	remove_submenu_page('SSR', 'edit.php?post_type=ssr_subjects');
	//Hide "Students Result → Add Subject".
	remove_submenu_page('SSR', 'post-new.php?post_type=ssr_subjects');
	//Hide "Students Result → Settings".
	remove_submenu_page('SSR', 'ssr_settings');
}

add_action('admin_menu', 'plt_hide_simple_student_result_menus', 11);

Where do I put this code?