An update is providing general information that is missing from the main content page of the school or college. You can start by mentioning when it was established and which affiliation it has, then move on to give details of the infrastructure and facilities, clubs if any, admission process details, fees and timings if known. This forms the descriptive update in addition to correcting or providing info about the website, address, contact number, etc.
A review is an analysis of the institute, writing about pros and cons. Thus, for example -
1. Whereas in an update you will mention there is hostel accommodation, in the review you will mention in what way it is good (such as enough space and cleanliness) or bad (such as being cramped, unhygienic).
2. In the update you can mention that there is a canteen, while in the review you will write about whether it is standard boring fare daily, what type - Chinese food? General junk food? Tasty or not, oily, expensive and better to eat out, etc.
3. In the review you can mention the accessibility and general location - is the station nearby? what are the good inexpensive eateries nearby?
4. In the update you will state sports facilities for which sport; in the review you can mention whether or not sports facilities are there at all or, say, that these are inadequate or not properly maintained.
In the review, do not mention the institute's website, contact details and the like. All this should only be submitted as an update. Also, courses offered at a college should be added (if not already there) only via the 'add course' link.
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.)