Soal SD is a free app developed by idemob.com for Android users. It is an education and reference app that aims to help students prepare for the national exam. The app contains a collection of practice questions for primary school students. Users can use the app to practice and test their knowledge in different subjects such as mathematics, science, and Indonesian language.

The app's main feature is its collection of national exam practice questions. Users can choose to practice a specific subject or take a full practice test. Each question has a timer, and users can see their score at the end of the test. The app also provides explanations for each question and highlights the correct answer.

Overall, Soal SD is a useful app for primary school students who want to prepare for the national exam. It is easy to use, and the questions are well-organized. The app also has a simple interface, making it accessible for all users.