Sổ tay Lịch Sử 11 is a free Android app developed by Vinsofts Mobile Team, aimed at helping students prepare for the Vietnamese national high school graduation exam. The app provides a comprehensive summary of the history program for grade 11, along with several useful features.

The app's features include an evaluation tool that allows students to assess their knowledge of the subject, an online quiz that helps students learn the material faster, and a reminder feature that helps students stay on track with their studies. The app also allows users to mark and take notes on the content they have studied, customize the app's display settings to improve readability, and share content with friends.

Overall, Sổ tay Lịch Sử 11 is a valuable study companion for high school students who want to achieve their best results in the Vietnamese national high school graduation exam.