JSFiddle - React, Tailwind, and code Playground

HTML

<div class="curriculum>Content</div>
<div class="curriculum">Content</div>
<div class="testimonial">Content</div>
<div class="testimonial">Content</div>
<div class="testimonial">Content</div>
<div class="curriculum>Content</div>
<div class="curriculum">Content</div>

CSS

div { padding:5px; border:1px solid red; }

JavaScript

var $wrapper = $('<div><div><h2>Testimonials</h2><div></div></div></div>');

$wrapper.insertBefore('.testimonial:first');

$wrapper.find('div div').append($('.testimonial'));