USA

Its a good thought that you have decided to pursue your Master's abroad. You have lot of things to concentrate on apart from GRE and TOEFL. Because the universities consider your overall profile and give the admit. You have to write GRE exam when you come to the 3rd year of Engineering so that you can fly immediately as soon as you finish your Bachelor's degree. GRE is for 340 marks and its totally online based test. You'll have only Maths and English in the exam. You also need to write two essays before you proceed to the main section, its called Analytical Writing Assessment (AWA). Scores above 310 is considered to be decent provided if you have a strong academic background. Try to score 75%+ in your Bachelor's, if possible present few national or international papers. You can also improve your profile by doing internships and projects. If you are planning for USA then take TOEFL instead of IELTS as some universities in US doesn't accept IELTS score. TOEFL is for 120 marks and it purely judges your ability to Read,Listen,Speak and Write in English. Even it is an online based test.
Overall, If you have 75%+ in Bachelor's with few paper publications, research works, internships or projects, 315+ in GRE and 100+ in TOEFL. Definitely you will get into top universities in USA.
Do remember the competition is at its peak for the Masters program in US
All the best !!!

To be commercial pilot in India, one should have a flying experience of 250 hours while in case of developed countries, the situation is not so. In countries like Europe, to have a basic licence experience, one have a flying experience of 750 hours. In foreign countries, the package is double to India. Sometimes, the pay is thrice or 4 times than India. On the other hand, these countries also made available lucrative avenues for the pilots. There is a more job certainty and satisfaction in abroad pilot jobs.
But as per my experience you will get a job only after good experience and training also aircraft rating as you have to do to make your licence to work in these sectors. It will cost you a lot to do ratings and all training.
And its really very difficult to get a job for new pilots having only 200 flying hours.

To pursue Bahelors in the US, you will be required to appear for SAT I (some universities demand SAT II on any two subjects) and TOEFL scores. Most Universities also accept ACT scores instead of SAT I. Applications abroad begin a year prior, hence if you are planning to go for Fall 2017 intake, then you will need to have your scores of the tests by September or October 2016. Applications are online; however you will need to send certain docs to each university you will apply to. Documents include transcripts, marksheets, resume, and rexommendation letters. Each university will have essay questions. The test scores, essays, recommendation letters, and your extracurriculars will play a crucial role in applicarion decision making, besides your academic performance beginning 9th grade. Remember every university has different admission requirements and deadlines, so check these details on their portal.