Ratings are calculated based on multiple factors including the number of published reviews, specific ratings, and other factors.
If you corrected information about an organization, then you will see the changes appear immediately in the place card on Yandex.Maps. However, you are the only person that sees these changes until they pass moderation (you'll receive the message “Thanks for updating information about this organization”). If the moderator determines that your correction doesn't infringe on any laws or other requirements, then your corrections become visible to all users. If you are a company representative, then make changes in Yandex Business Directory.