I am studying in class 12th . Which examination I have to clear to get admission in American or Canadian Universities

GMAT  Most B-schools abroad ask for Graduate Management Admission Test or GMAT scores when admitting international students. ... GRE  Students take up Graduate Record Examination or GRE when they want to study graduate or business programmes in countries like the USA and Canada.

Feel free to comment if you have any doubt
Good luck

Hello

You have indicated US as a Choice of country. You need to write SAT exam and get a good score of atleast 1700 plus out of 2400 to get admission in to a good University. You are also required to write TOEFL exam.
You need to choose a few Universities which offers Biotech in US and start your Online applications as soon as possible. I would advise you to use a good education advisor to assist you.
If you are not prepared to write SAT, then you can look at applying to Universities in UK, Australia, New Zealand, Netherlands, where the admissions are purely based on your 12th standard marks and you are required to write either TOEFL or IELTS depending on the Country of Choice. You should start early to avoid disappointments.
The standard documents reuqired are your 10th standard marks, Statement of Purpose, two Recomendation letters from your teachers, etc. You need tohave a Passport to write IELTS or TOEFL exams. To get in to good Universities, you need to score atleast 75% and above and to be eligible for scholarships, you might need over 90% plus. For more visit study abroad

I hope it will help you
Good luck  ...

Hello Dilraj

You must meet some requirements to get admission in the top class U.S. universities. It is important that you studied English, mathematics, natural science (biology, physics, and chemistry), humanities and social science (history, geography, economics, political science, or other similar subjects), and foreign language. One thing you need to keep in mind that you have to be very strong in writing and speaking in international language i.e. English.

To prove your English knowledge, you need to crack some of the international language tests like IELTS[1], TOEFL, and SAT. These are the global level of language testing exams that ensure the merit of the foreign language of a student. 9 is the highest score brand, where you have to score minimum 6.5 to prove your efficiency. There are four stages of those exams- reading, writing, listening, and speaking. One must have to bring at least 6.5 scores in each to study in USA[2]. Also, crack these examinations successfully help get the students visa when you are migrating.