The first International Baccalaureate (IB) course that promotes the acquisition of communicative skills and prepares students for the Ab Initio diploma. The Student's Book consists of twelve didactic units structured in different sections that work on specific content and objectives for learning Spanish and for comprehensive IB preparation. The Me preparo para el IB and Consolida sections allow students to practice with tasks that simulate exam tests. Each unit culminates with a Creativity, Activity, Service (CAS) project aligned with the Sustainable Development Goals (SDGs), thus connecting learning with the real world. The book includes a digital extension on the ELEteca platform, offering practice exercises for the exam sections, audio files for listening comprehension activities, and course videos.