Test para Oposiciones a Bibliotecas is a free Android app developed by RDEMA Apps that helps individuals prepare for and pass exams for library jobs, such as Técnicos Auxiliares de Bibliotecas in municipalities, autonomous communities, or the state. The app contains questions related to the laws and specific topics that are typically included in the job postings for these positions. It is divided into various thematic blocks that include the topics commonly used in job postings, such as the history of libraries in Spain, the concept and function of library services, various types of libraries, accessibility in libraries, and the collection of the library. Additionally, the app includes questions from official exams from previous years, as well as information about the Spanish Constitution, fundamental rights and duties, public function and labor personnel of public administrations, equality laws, safety and occupational hazard regulations, and territorial organization. The app also offers news and updates on public job postings, a study mode, and an individualized improvement and study plan. Overall, this app provides a dynamic, enjoyable, and practical way to prepare for library job exams.