Sure! Here's a Rajshahi paragraph for different classes, ranging from Class 1 to Class 12:

Class 1: Rajshahi is a city located in the northwest region of Bangladesh. It is known as the education city of Bangladesh due to its numerous educational institutions. The city is surrounded by lush green fields and has a rich cultural heritage. Rajshahi is famous for its delicious mangoes and is often called the "Mango City."

Class 5: Rajshahi is a historic city in Bangladesh. It is situated on the banks of the Padma River and has a population of over a million people. The city is known for its educational institutions, including Rajshahi University, which is one of the oldest and most prestigious universities in the country. Rajshahi has a tropical climate with hot summers and mild winters. The city is also renowned for its mangoes, silk production, and archaeological sites.

Class 8: Rajshahi is a major city in Bangladesh, located in the northwestern part of the country. It is the administrative headquarters of Rajshahi Division and has a rich historical and cultural heritage. The city is famous for its agricultural production, particularly mangoes, lychees, and jute. Rajshahi University, established in 1953, is one of the leading educational institutions in Bangladesh. The city has a vibrant cultural scene, with various festivals celebrated throughout the year.

Class 10: Rajshahi, also known as the Silk City, is a metropolitan city in Bangladesh. It is the capital of Rajshahi Division and is situated on the northern banks of the Padma River. The city has a thriving economy based on agriculture, trade, and industry. Rajshahi University, with its sprawling campus, is a renowned educational institution in the country. The city is also famous for its silk production, mango orchards, and archaeological sites like the Paharpur Buddhist Monastery.

Class 12: Rajshahi is a bustling metropolis in Bangladesh, located in the northwestern part of the country. It serves as the center of trade, commerce, and education for the Rajshahi Division. The city has a rich historical background, with archaeological sites like Mahasthangarh, Paharpur, and the Sompur Bihar. Rajshahi University, established in 1953, is one of the country's top universities and attracts students from all over Bangladesh. The city's economy is driven by agriculture, with crops like mangoes, lychees, jute, and rice being major contributors. Rajshahi is also known for its cultural festivals, vibrant art scene, and mouth-watering cuisine.

Please note that the complexity and depth of the information provided increases as we move from lower to higher classes. Feel free to adjust or modify the paragraphs according to your specific requirements or curriculum.