This version contains 99 multiple-choice questions according to the exam structure of the National High School Chemistry exam. All multiple-choice questions have answers and nearly half of the questions (45 questions) have hints and reference solutions.In addition to the chemistry multiple-choice practice questions, the application also has a review of chemistry theory for grade 12 in high school with topics and several types of multiple-choice problems according to each topic:- Esters & Lipids.- Carbohydrates.- Amino, Amino Acid, Peptide & Protein.- Polymers and polymeric materials.- Metal.- Alkali metals, alkaline earth metals and aluminum.- Iron, copper and chromium.- Identify some inorganic substances.Hopefully this application will be useful to those of you who are preparing for the national high school graduation exam.