**Explanation:**

There could be several reasons why your school does not have the Balbharati book. Here are a few possible explanations:

**1. Curriculum Differences:**
- Different schools may follow different educational boards or curricula, which could have different prescribed textbooks.
- Your school might be following a curriculum that does not include the Balbharati book.

**2. Educational Policy:**
- The educational policy of your state or country might not require the use of Balbharati books in schools.
- The authorities responsible for curriculum development and textbook selection may have chosen other textbooks that they consider more suitable for the students.

**3. Availability and Affordability:**
- Balbharati books may not be widely available or easily accessible in your area, leading to schools opting for other textbooks that are more readily available.
- The cost of Balbharati books might be higher compared to other textbooks, making them less affordable for some schools or students.

**4. Local Language or Regional Focus:**
- Balbharati books may be primarily available in a specific regional language, while your school might prefer textbooks in a different language.
- Some schools may choose textbooks that have a regional or local focus, catering to the specific needs and interests of students in that area.

**5. Pedagogical Approach:**
- Your school might have opted for other textbooks that align better with their chosen pedagogical approach or teaching methods.
- Different textbooks may have different approaches to presenting information, activities, and assessments, and your school might have chosen a book that they believe suits their teaching style better.

It is important to note that the reasons for your school not having the Balbharati book can vary depending on the specific circumstances and policies in your school, region, or country. To get a more accurate understanding, it would be best to consult with your school authorities or teachers regarding the choice of textbooks and curriculum.