Why are Rana and Runa are studying hard? (Understanding)

There are four persons mentioned in the text.

Runa's mother is a nurse and her father is a book-seller. They are worried because they are very busy with their work and cannot always take proper care of Runa and Rana during their exam time.

The family members support each other by sharing responsibilities. Rana helps Runa with her lessons and also helps his father in the book shop. Runa helps her mother with cooking and studies regularly to get a good result. This teamwork makes the family strong and happy.

Rana helps his father in the book shop.

Runa's mother is a nurse and her father is a bookseller. So they are very busy in their duties.

I expect to get a good result in my exam by being attentive in my class, preparing my lessons regularly and studying attentively.