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Mechanical, electrical and computer science are evergreen branches. Electronics and communication is bit a hybrid as most IT companies favors ECE students more after CS/IT students. Civil is good for those interested in designing and planning of structures.
Electronics and instrumentation is favorable for those with interest in electronics and control systems of manufacturing plants or turbines. Robotics is a growing career option still untapped in India, it needs both ECE and EI. From past 15 years, CSE is being the first choice of students and still the trend is same. Placements also reflects the same.
As the advancements are taking place at a rapid rate in and around, nanotechnology and data science are two fields which are growing at faster rate. At the end it is an individual's decision as per his/her interest.

To become a commercial pilot :
-You need to possess a student pilot license. You must be over 17 years of age and have completed 12th in science (Physics and Mathematics) with 50%.
-Your vision in one eye must be perfect. In general medical terminology, it is called 6/6 eyesight. In the other eye, you could have an imperfection of 6/9, which must be correctable to 6/6.
General physical fitness is mandatory. You must be free of any disease that can hamper normal function.
-You need to register at a flying club which is recognized by Directorate General of Civil Aviation (DGCA), Government of India.
-Next is a private pilot license which includes sixty hours of flying. A CPL may be obtained only after a PPL and 250 hours of flying.
* Some of the institutes offering commercial pilot training are :
-Academy of Carver Aviation Private Limited, Pune
-All India Institute of Aeronautics, Dehradun
-Center for Civil Aviation Training (CCAT), Delhi
-Glorietta Aviation, Ghaziabad
-Fly wings Aviation PVT. LTD., Mumbai
For more, you may refer to the link mentioned below.
https://hospitality.shiksha.com/commercial-pilot-training-in-india-categorypage-6-87-301-0-0-1-1-2-0-none-1-0#page-top

The Graduate Record Examination (GRE) is a standardized test that is an admissions requirement for most graduate schools in the United States. Created and administered by the Educational Testing Service (ETS).
The exam aims to measure verbal reasoning, quantitative reasoning, analytical writing, and critical thinking skills that have been acquired over a long period of time and that are not entirely based on any specific field of study outside of the GRE itself.
There are no specific eligibility criteria for GRE. Aspirants can register for the test irrespective of age and qualification. Many graduate schools in the United States require GRE results as part of the admissions process for MS. Different graduate schools have their own criteria for admission and minimum GRE score.