Career

Hi
For Master's at IIT, you need to appear for IIT JAM and GATE is also accepted. For abroad, you must have GRE/GMAT score and IELTS/TOEFL. Rest of the requirements will be as per the country you choose to apply. You may go for M.tech/ M.E / Mba abroad. For USA, take a look here.
http://www.masterstudies.com/Masters-Degree/Engineering-and-Technology/USA/

Petroleum engineers have opportunities for job at offshore on water rigs as well as oil wells in plains in oil/gas exploration. Petroleum Engineers are also have equal or more opportunities for employment in Petrochemical plants.

Hey Sundaram,
You should take admission in B.Tech CSE. Along with this select a university which emphasizes on practical knowledge and industrial experience. Meanwhile you can also visit websites like coursera, edx etc. Some best universities suggestions -

Dear Divya,
With this combination you can go for these fields :
Physics / maths hons
Environmental Science
forensic science
Geo-informatics & Remote Sensing
Mca
Nanoscience
Actuarial science
Now you can search on this fields and choose accordingly.
All the best