IIT Bombay tended to be slightly more selective than other IITs because a disproportionate number of successful candidates came from Bombay region and preferred IIT Bombay over other IITs. Electrical engineering was the first to close its door around JEE rank of 200. Later, newly opened computer science department seems to have been even more selective. Mechanical and Chemical engineering were comparable and admitted candidats with JEE rank of around 500 or below. This list was followed by metallurgy, aeronautics and civil engineering. Physics, chemistry and mathematics were the last to go. After the rank of 1200 or so, the only choices Bombay region candidates had left for them were things like agriculture department at Kharagpur IIT. Most didn't take it. Possibility of being able to change major to a more desirable one was quite slim after that first chance.
IIT Bombay tended to be slightly more selective than other IITs because a disproportionate number of successful candidates came from Bombay region and preferred IIT Bombay over other IITs. Electrical engineering was the first to close its door around JEE rank of 200. Later, newly opened computer science department seems to have been even more selective. Mechanical and Chemical engineering were comparable and admitted candidats with JEE rank of around 500 or below. This list was followed by metallurgy, aeronautics and civil engineering. Physics, chemistry and mathematics were the last to go. After the rank of 1200 or so, the only choices Bombay region candidates had left for them were things like agriculture department at Kharagpur IIT. Most didn't take it. Possibility of being able to change major to a more desirable one was quite slim after that first chance.