Iran's secondary education system faces stagnation and a lack of flexibility due to its "annual-track" structure and uniform curriculum across all regions—a status that fails to align with rapid social, cultural, and technological changes and can lead to declining educational quality, intensified inequality, school stratification, rising costs, and diminished teacher motivation. This structure also overlooks many equity-driven curriculum planning principles—such as attention to individual talents, personalized learning, differentiated instruction, and cultural content suitability—limiting flexibility to solutions like specialized schools or academic acceleration. The proposed strategy rests upon designing a "semi-flexible" structure situated between the two extremes of an inflexible annual system and a completely flexible unit system, wherein a portion of courses is offered as common mandatory packages and another portion as elective specialized units. This model provides opportunities for continuous content modernization, a sustainable link between education and employment/society, the strengthening of new skills (digital literacy, research, multiculturalism, art, artificial intelligence), greater teacher autonomy in teaching methods and assessment, and enhanced educational equity through expanded choices for students in deprived regions. Furthermore, reorganizing schools into "educational complexes" and reducing excessive reliance on traditional final exams are introduced as prerequisites for achieving this transformation.