SAT

You should definitely consider your study preferences, SAT goals, and resources before deciding on a study plan. In general, we recommend starting your SAT prep early. About three months before your test should give you enough of a buffer to try a few study approaches and get comfortable with the test content.

Most universities in the US accept SAT score. But SAT is not the only parameter they look at. Unlike in India where you get admission directly on the basis of your entrance exam score, in the US you actually need to go through a holistic application process. All universities have different requirements and a college application which you need to fill in order to apply. There is no particular qualifying score for SAT and the average SAT score per college varies depending upon how competitive the college application process is.

If you take one, it will be enough. This exam is to prove your English proficiency to study abroad. IELTS is written directly by hand and TOEFL is an online exam. Whatever is convenient for, you can do it. Any of them is enough for you to study abroad.

You take some coaching and write IELTS exam. You can apply to university with your PUC mark sheet and IELTS mark sheet. You can register on Shiksha itself if you want to study in Canada.

SAT is a standardized test required for getting admissions in USA, Canada and some other countries. For taking SAT, you have to register for the same.

Anyone who is in high school or passed twelve standard can give SAT exam.

It totally depends on your percentage. After that, you have to give a paper conducted by the foreign university. If you qualify, then you have to fulfill all its criteria for going abroad.

I am attaching a link where you can get details about score wise scholarship. You can go through this link to get information: https://www.scholarships.com/financial-aid/college-scholarships/scholarship-directory/sat-score
Good luck.