USA

Hi,
It depends on which fall session or intake you want to get into. If you are targetting Fall 2019, you must submit your application by this year-end. Normally, the first-round deadlines are during September or October. The sooner you apply, the better are the chances. Many universities will allow you to apply before your 12th results are out. Just check with the universities directly. Check Common App portal to learn about the admission requirements and documents you need to send. The process is online, you just need to upload them. Academic transcripts from 10th to 12th, reference letters, essays, SAT and TOEFL scores are some of them.

Hi Sonmohita,
Typically, when you are applying for UG programs abroad, the university will consider you for a scholarship by default at the time of admission. In some case, you need to specify the same in your form. It's all given on the merit basis. Your profile seems good. You must now aim for a very high SAT score (above 1400) to get a chance for the scholarship. You should also note that a full scholarship is very difficult for international students, they hardly give full funding unless you have more than 95% or so in your academics and some brilliant extracurriculars. As of now, you should start checking university websites and understand the admission requirements. Email them for financial aid. Check the deadlines and other requirements.