Ayuda PSU Ciencias Sociales

Exceed 120000 downloads among all PSU help, thank you all for your support and feedback. I am now moving on upgrades to applications, adding more content and other functionality that help more.
The invite also review a youtube channel I created, where I am adding interactive PSU questions.
http://www.youtube.com/user/AyudaPSUClases
I will also upload videos there to answer questions, and that people who do not have smartphone with Android can practice in a similar way too.
Practice for PSU while you're in the Micro!
This application allows you to practice with brief bursts of exercises, all sections of the PSU Social Sciences:
- The geographical area national, continental and global
- Timeline of Chile
- The historical legacy of the West
The rounds are 10 questions each, randomly selected from a database of over 200 questions in total, which will include more questions constantly to prevent the repetition of exercises.
Each question in turn has its solution and corresponding explanation, in order to be able to learn the reasoning on which each question is solved.
I hope you can take advantage of content delivered and do very well!