Mai Manh spent the month working on the dungkhmt/openerp-micro-service repository, where he developed the Class Registration Week Selection feature for the registration workflow. Using React, Material UI, and JavaScript, he enabled administrators to define start and end weeks for class registration, with built-in validation to prevent overlapping periods. The feature displays selected week ranges directly in the registration form, improving scheduling accuracy and reducing the risk of conflicting registrations. By updating the RegisterClassScreen component, Mai Manh enhanced the user experience and reliability of the registration process. His work focused on frontend development and robust form validation logic.