you can use the per_get_posts
filter hook to change the order of the query something like:
add_filter('pre_get_posts', 'filter_homepage_posts_order');
function filter_homepage_posts_order($query) {
//only run is current page is home page
if ($query->is_home) {
$limit_number_of_posts = 5; //number of posts
$featured_category_id = get_cat_id('Reviews'); // by cat name...
$query->set('cat', $featured_category_id);
$query->set('posts_per_page', $limit_number_of_posts);
$query->set('order','DESC')
}
return $query;
}