SAT

Dear Risabh,
SAT is the standardized aptitude test for admissions in the universities of USA and Canada mostly. It mostly includes high school level mathematics, english and reasoning skills. TOEFL and IELTS are tests for proficiency in English language. You need to take either one of TOEFL or IELTS when you apply abroad. Every university has its own score requirements which you will find on the respective websites, For more details you must check the official websites.
https://collegereadiness.collegeboard.org/
http://www.ets.org/toefl
https://www.britishcouncil.in/exam/ielts
Regards

Please explain or elaborate your query. These are standard tests for admissions abroad, for details you must check their official websites.

I have studied abroad for my Bachelors degree and it was and is extremely expensive. Your living expenses are INR 10 lakhs per year and the tuition fee is minimum INR 10 lakhs per year. If you want to study HSC Year 12, you would have repeat 2-3 years. Hence I strongly recommend that you finish your Bachelors degree here in India with good percentage or grades. Then you may go abroad. Hope this helps. Thanks!

How can someone else tell you if you find the exam tough or easy? Its upto your strength and weak areas. Since it is the test to get into American universities it is not going to be easy else there would be no test at all.

NO!.
You should have min. 50% marks in 12th standard
and should have given JEE Mains Exam with a non zero and non negative score

If what you seek to study at any US academic institution such as a College/Institute/University is at the undergraduate level then a SAT/ACT and the TOEFL are both mandatory. Consult your desired institutions' website and/or e-mail them. Thanks for the opportunity. Hope this helps!

SAT is taken for entry into bachelor degree programs. To pursue MBA you must take GMAT or GRE.

Hi
SAT is just one part of whole profile so if you are looking for admission in any of the colleges, you need to hv around 1580 and a holistic profile that includes co-curricular activities, community services etc. In addition to SAT subject based SAT for math is also required. Check here.
http://mitadmissions.org/apply/freshman/tests