KeyBook English 12 Class PTB is an Android education and reference application developed by Duzz Apps. The app is free and designed for F.Sc, F.A, I.Com, ICS, D.Com DBA, and Intermediate Part-II students who are preparing for their English exams. The app provides a comprehensive and revised book, The Learner's English grammar and composition.

The app includes a list of all chapters, heroes, and Mr. Chips with question and answer sections. It also provides pairs of words, essays, and translations. This English 12th guide is suitable for students who prefer short questions and answers that help them score high in their exams.

The English 12th class notes are designed to increase the knowledge of students in their exams. The app also includes English 12 solutions and some English 12 class notes. The app is easy to use and contains relevant and accurate information. However, the app could benefit from additional features to improve the learning experience. Overall, KeyBook English 12 Class PTB is a useful app for students preparing for their English exams.