1. Ostim Technical University Preparatory School uses the Languo English Coursebook Series. This series of books have been developed by Prep School instructors. It consists of four books pertaining to four different levels established by the CEFR: A1 (elementary), A2 (pre- intermediate), B1 (intermediate), and B2 (upper-intermediate). What makes these books unique is that they have a scope and sequence prioritizing local and Turkish cultural values in accordance with the World Englishes theoretical framework.
2. In addition to Languo, the Macmillan Skillful Reading & Writing Series books are used to improve students' academic reading and writing skills.