Global K-12 Private Education Market Size, Share & Demand Report By Education Level (Pre-Primary Education, Primary Education, Middle School Education, Secondary Education, Senior Secondary Education), By Curriculum Type (National Curriculum, International Curriculum, Hybrid Curriculum), By School Type (Day Schools, Boarding Schools, Day-Boarding Schools), By Fee Structure (Premium, Mid-Tier, Affordable Schools), By Delivery Mode (Offline, Blended, Online), By Region & Segment Forecasts, 2026–2031