hemanshudhuria
Usually, the most authentic scholarships are mentioned during the university application/website itself. For some of the universities, a separate questionnaire/application is required, for some of them, they give based on your application.
The best financial aid is to go to a university where you easily get a TA/RA job role, in that case your tuition fee gets waived off, this is most common with public universities and not private universities.
For external scholarships, you can simply google for that.