Hi Vinay,

It's nice to know that you are interested to pursue your undergraduate course from abroad.

SAT is one of the exams that is used for admission to UG programs in many countries. Your acquaintance must have also taken the same test. 

Along with SAT, you would also be required to send your English Language Proficiency Score  to the universities. Please go through the links below to know more about the exams.

What is SAT

Best countries for UG engineering abroad

After the exams, you would be required to fill the in the application forms of the universities which would then shortlist you or offer you a seat based on your scores.

Hope this helps you. Do revert if you need more information.

Best wishes,