Hello applicant,

* I will explain you about the SAT,LELTS and JEE exam firstly about the SAT exam:-

*This is the exam which is conducted for students looking for admissions to a college or university undergraduate program, or applying for scholarships etc. This Scholastic Admission Test (SAT) is eligible  for all the candidates who wanna study at  abroad in countries like the USA, Canada, Australia and other countries

* IELTS exam  is  a english proficiency test and it is   internationally accepted and the exam  is conducted by the British Council, IDP Education, Cambridge Assessment English. This exam is conducted for those who wanna  study or work abroad and whose first language is not English.

*Where has the JEE Main exam  is a national level exam which is  conducted for students who are  seeking admission in top engineering colleges.

*So, the best exam for b.tech in abroad is Scholastic Admission Test (SAT) exam

Hope it helpful