Hello aspirant,

There are many non engineering based career options to choose from after completion of diploma.

• Pursue three year non-engineering regular graduation programmes such as B.Sc, B.A., BCA, and B.Com. then pursue civil services via UPSC.

A job in the following sectors:

• Railways
• Indian Army
• GAIL – Gas Authority of India Limited
• ONGC – Oil & Natural Gas Corporation
• DRDO – Defence Research and Development Organization
• BHEL – Bharat Heavy Electricals Limited
• NTPC – National Thermal Power Corporation
• Public Work Departments
• BSNL – Bharat Sanchar Nigam Limited
• Irrigation Departments
• Infrastructure Development Agencies
• NSSO – National Sample Survey Organization
• IPCL – Indian Petro Chemicals Limited

A job in the private sector companies like:

• Airlines - Indigo, Spicejet, Jet Airways, etc.
• Construction Firms – Unitech, DLF, Jaypee Associated, GMR Infra, Mitas, etc.
• Communication Firms – Bharti Airtel, Reliance Communications, Idea Cellular, etc.
• Computer Engineering Firms – TCS, HCL, Wipro, Polaris, etc.
• Automobiles – Maruti Suzuki, Toyota, TATA Motors, Mahindra, Bajaj Auto, etc.
• Electrical / Power Firms – Tata Power, BSES, Seimens, L&T, etc.
• Mechanical Engg Firms – Hindustan Unilever, ACC Ltd, Voltas, etc.

Accordingly you might choose colleges because there are a lot of options to choose from

Hope this helped!