Group 1 - Parents need to update their individual income tax information when their children transition between educational stages, such as from kindergarten to primary school or from high school to university [1][2] - It is recommended that parents complete these updates by the end of August, before their children start university, to ensure seamless tax deductions starting from September [1][2] Group 2 - The process for updating tax information involves logging into the personal income tax app, selecting the relevant options, and adding a new entry for the child's current educational stage [2][8] - Parents should not directly modify existing entries but instead add new information to avoid losing previous deductions [8] Group 3 - Upon receiving university admission letters, parents should assist their children in preparing for enrollment, which includes ensuring all necessary tax information is updated [9][11] - There are important precautions to take when receiving admission letters to avoid scams, such as verifying the authenticity of the letter and using official channels for any required payments [14][15][16][17][18][19][20][21]