The shortcode of the BuddyPress Group Reviews plugin is [add_group_review_form]. If you use this shortcode on the page, then it will display Add review form.
What is Shortcode of BuddyPress Group Reviews plugin
Update on May 26, 2022
The shortcode of the BuddyPress Group Reviews plugin is [add_group_review_form]. If you use this shortcode on the page, then it will display Add review form.