Completed my diploma in electronics 4m vjti & plc programing 4m smec now I decided to apply degree which sub field is better for me in electronics?

Thank you for invitation, Pardon me, I am not expert in this field. 

Wish you all best of Luck 

Dear Sahil,After greeting, thanks for the invitation, as far as I know you are a graduate from technical institute which based in India, for PLC programming works of field are highly demanded in electronic manufacturing and robust systems from ladder/ Functional Block Diagram you can increase knowledge in SCADA and apply in Siemens company or other postgraduate training programs.Other point you can works in Digital Signal Processing (DSP) by means travel abroad for scholarship or any other ways to college with DSP strong training program.

i think u can go for instrumation , electronics , (TELE)communication its also depend where u want to do MS or ME  in future ,keep the core lit bit same through out ur degree

Industrial Automation or Instrumentation is better

I think you can continues your education in instrumentation filed.  . 

as my search there are many differed program and might be almost the same

Automated Controls and Instrument Option in Electrical/Electronic(s) Engineering

Control and Instrumentation Engineering Technology

Process Instrumentation and Control Engineering

with other term such automation and mechatronic

i will advice you to visit www.abet.org 

and write "instrument" then search your country. the system will search among the program within these term in your country where you can have accredted program from ABET

i wish you best of luck in your education 

I don't know exactly what is the form of education in your country. But for me, based in my country if I want a degree, I will go with the Degree of Electronics and Communication Engineer (E.C.E). Because you already taken a diploma of electronics. So go with that E.C.E.  As an average student it will fits you. Anyway, there is no such thing as an average or above average student. As long as you study hard, have strong determination and you will succeed.

As per my knowledge, Instrumentation will be suitable for you.

All the best.