You can use the following platforms to apply for an articleship at Big4:
Websites like Naukri.com, Monster, and LinkedIn's online job portals are official sites for the Big 4 CA firms.
References and connections: an effective method
Big four corporations typically give opportunities to students who:
pass either both groups or only one CA group (usually on the first try) intermediate with distinction
possess excellent communication skills, self-assurance, and command of the English language.