I've completed HS 2nd year. And now I want t do engineering in abroad. So what would I have to do to get an admission in a good university??

Give GRE and TOEFL/IELTS

Dear Kouxik ,
Undergraduate Engineering abroad is opted by a number of students in India. Have you thought about which country or university you would like to pursue your course?
Moreover, what is your academic background? What  you your CGPA? What extracurricular activities do you pursue? These are some of the questions which would matter a lot in your admission process.
A number of universities abroad accept the SAT  or ACT score for admission to their undergraduate programs.
Along with these, you would be required to score well in the English proficiency tests like IELTS,  TOEFL.
The top 10 universities in the world for Engineering and Technology are:
1 Massachusetts Institute of Technology (MIT)
2 Stanford University
3 University of Cambridge
4 ETH Zurich - Swiss Federal Institute of Technology
5 Nanyang Technological University, Singapore (NTU)
6 Imperial College London
7 National University of Singapore (NUS)
8 The University of Tokyo
8 University of Oxford
10 Tsinghua University
Do revert if you have any more questions.
Best wishes,