Hello Saro,
If we talk about the best engineering fields,then whether it is tamil nadu or any other state in India. CSE and IT are considered as best everywhere.Because software engineers are most saught after in India. So, it is not surprise that these branches are at the top. These branches offers higher pay package than other branches. Your starting salaries as a fresh computer engineer from a good Institute can range 4.5 LPA to 6 LPA. As you move uo the management rank,your pay can go up from 20 LPA to 60 LPA. Some of the best companies that hire computer engineer are Microsoft, Google, Yahoo, Amazon, Facebook,IBM,Infosys,TCS,Accenture and Wipro etc.