SAT + University
The best time to start thinking about college is in the 10th grade. During this time, you should choose extracurricular activities and get involved in clubs or organizations that interest you. In the 11th grade, you should take the tests that will be required for admission: SAT, SAT Subject Tests (at least 2), and TOEFL or IELTS. At the beginning of your 12th grade year, you should actually start the application process. Ideally, you'll research and visit universities the summer before and start gathering applications in September.
The SAT is an American college admissions test required by most universities in the USA and even many universities in Dubai (Want to go to AUS or AUD? You'll have to take the SAT!). The SAT tests 3 broad categories: math, reading, and writing.
The SAT Subject Tests are a group of tests designed to test you on your knowledge of different subjects. They used to be called the SAT II Tests because the original SAT was called the SAT I. Now they are referred to as the SAT Subject Tests. Unlike the SAT, they are only 1 hour long (each) and do not have essays. There are 17 different SAT Subject Tests