Shaz Zist is an Android app designed to help students prepare for biology exams, specifically for the 12th-grade national entrance exam in Iran. The app offers a comprehensive collection of biology questions, divided into two categories for each topic: the first category is made up of four-choice questions to help users prepare, and the second category is competitive exam questions. Each topic has several competitive exams, which users can participate in and compare their results with others. The app also includes two additional sections: a review section for questions that users have answered incorrectly, and a summary of key concepts for each chapter. Shaz Zist is a free app developed by Zagros Polytechnic and is a great tool for students preparing for the biology exam.