I have secured 615580 rank and in JEE Mains and 78.4% in 12th. Will I get B.Tech in any top college?

Your placement in the JEE Mains with 615580 rank and 78.4% marks from 12th grade reduces your potential to enter top-quality B.Tech institutions. Most IITs along with NITs and IIITs require new students between 20,000-50,000 ranks. You might secure admission to either private engineering institution