That page is of reviews of schools and colleges only. Like in other sections, the member posting reviews can check which are pending, deleted, approved and a list of his/her reviews under 'My Posts.'
The 'Submit your comments' feature was introduced to allow the institute's management to put in a comment / objection to the review. Thus, it is generally filled up by those who do not agree with a bad review and will allege that the institute is indeed good! Of course, members too can post a comment, pointing out, for example, that the infrastructure is not as bad as is claimed in the already submitted review. However, instead of just a one line comment, we would much rather have a full-fledged review, where the member can start by saying, for example, 'The review posted earlier about this school that it lacks sports facilities is not applicable now. The school has upgraded its infrastructure and now offers facilities for indoor sports, namely, badminton, table tennis and basketball.' The member can then add some more analytical content (the good & bad of the school), thereby making it a more informative review.
When people come at you with their worst, you should come at them with your best (advice given to Selena Gomez by her mother, quoted in Time magazine.)