Học Thêm Toán 9 ở Hà Nội is a free Chrome add-on developed by Nam Nguyễn. It falls under the Browsers category and specifically the Add-ons & Tools subcategory.

This program is designed to provide additional math tutoring and preparation for students in Hanoi who are studying for their 9th grade math exams or looking to improve their math skills. Led by experienced teacher Thầy Cao Đình Tới, the program offers classes for students with varying levels of proficiency in math, including those who are struggling, those who are already proficient, and those who are aiming for high scores.