can we change the course in the same college after writing our 1st semester
The answer depends upon the vacancy of seats in the college, for example, most autonomous colleges, intake 240 students from ECE branch, so if the number is filled, you cannot enter that course, these rules on which how many people can be intaked depends on AICTE rules and cannot be changed, however if you have good merit and the branch has available seats, you can opt for other branches.