3 Sinf is an educational reference book available for Android. Developed by Akmaljon Badalov, this app provides users with access to a PDF textbook for the third grade. The book is written in the Uzbek language and covers various subjects relevant to the curriculum.

With 3 Sinf, students can easily access their textbook on their Android devices. The app allows them to study and review the material at their own pace, making it a convenient tool for learning both inside and outside the classroom.

In addition to the main textbook, 3 Sinf also provides access to other related books. Users can find additional resources and materials on the Telegram channel "kitoblar990" and download the Yandex Go app through the provided link.

Overall, 3 Sinf is a useful app for third-grade students in Uzbekistan, offering a digital version of their textbook and access to supplementary materials.