If You are asking about IES (Indian Engineering Service Officer)  then you need to have the following branches of Engineering:

• Civil Engineering.
• Mechanical Engineering.
• Electrical Engineering.
• Electronics and Telecommunication Engineering.

If this isn't clearing up your quarry then repost the question in a manner so that we can understand what you want to know and we can provide you all the information required.

To know more about the UPSC ESE visit the link below:

https://competition.careers360.com/exams/upsc-ese

I hope this answer helps. All the very best for your future endeavors!