Hello Shekhar,
Nowadays,  most of the students wish to get into IITs, NITs and many other top colleges. But to get this they need to work very hard and smart. So for this they choose integrated college for 11th and 12th in which they only have to attend the college for practicals and the remaining time they can spend for studying for entrance exams.
This helps alot to the students as they get more time to study and if they utilize their time very well they can do really great in future.
so if time used properly integrated college can be helpful in future.
Hope this may help you.