If you want to take admission to Engineering course then you should have qualified class 12th with Physics, Chemistry, Mathematics, language and any other subject. Entrance exams are conducted for admission to Engineering programme. Entrance exam like JEE Main which is a National level exam which is conducted for Undergraduate Engineering admissions into NITs, IIITs, and GFTIs.
Some Universities conducts its own entrance tests for admission like SRMJEEE, VITEEE, WBJEE, MUOET, etc.
Hope this helps.