First of all government polytechnic colleges are good . As you didn't mention the area of the college,I will choose the set India. Some good colleges are

1. Veermata jijabai technical institute, Maharashtra.

2. Ganga institute of technology,Jhajjar.

3. Dev Bhoomi institute,Dehradun.

4. Chandigarh college engineering.

Hello,

Here is the list of top colleges in madhya pradesh for diploma in civil engineering

• shri vaishnav polytechnic college, indore
• Rabindranath Tagore university, Raisen
• swami vivekananda university, sagar
• sardar vallabhbai polytechnic college, Bhopal

Please click the below link to know about other colleges in madhya pradesh with polytechnic in civil engineering

https://engineering.careers360.com/colleges/list-of-diploma-in-civil-engineering-colleges-in-madhya-pradesh