Hey sanjiv,
Firstly, if you wanna get into American university you need to write this test called the SAT. The test is for 1600 marks. You can write the SAT any times you want. There is no limitation.
Then you can write the SAT Subject Tests. Only a few ivy league colleges require you to write the Subject Tests. Write these only if you get a really good score in the SAT i.e. above 1400 or 1450.
Then after getting your results for the SAT(and after you are satisfied with) you need to write another test which is the TOEFL (since you are an international student).
After you get the results of both the SAT and the TOEFL you will have to start applying to colleges before their deadlines (usually in the third week of november or 1st week of december). You will have to submit an application to the university that you are applying to. Your application should have your 10th class reports and your 11th class reports (ask your college/school). Yes, American colleges don’t see your 12th score but you have to do well as they might reject you later because of your score. Try to get around 80%. You need to submit an SOP(Statement Of Purpose) which an essay describing your achievements, your plans and basically everything about you (SOPs are really important). Then you will have to have LORs (Letter Of Recommendation) from your teachers. Some colleges need it, some don’t. After you submit the application with all your test scores, reports and certificates to the universities you will get your results on the month of March(mostly, but depends on the college). This is really important: American colleges give equal importance to extra caricular activities. So if you only have good grades, don't expect to get into some colleges. You need to give them all the certificates you earned too and write about your achievements in the SOP.
If you are accepted into the college then you can go ahead and find out how to join. While going through the VISA process you need to submit a bank statement to the ambassadors.
I hope you query is cleared
thanks for asking
stay safe
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