Integrated MSc courses are same as othe undrgraduate courses exvept that you dont get a tech degree. The courses are mainly in Mathematics,Physics,Chemistry,Economics, Geophysics,etc. So if you choose mathematics your profession may be in banking sector.
In IIT Kharagpur , the students from Integrated Msc in Maths and Computing and Exploration Geophy are the ones with highest paid jobs .
One fact about IITs are that your job doesnt depend much on your department . Its your aptitude and talent which gets u a gud job. Most people dont prefer MSc coz they want a tech degree so they go to other iit or t the fact is that this course is very rich nad has got as good prospects as other courses.
And above all , from this year , the students of Integrated Msc will get a scholarship of 80,000 per year for research .So if u getting a low rank dont worry ,
join Int.MSc programs :)