Dear aspirant, yes ofcourse you can change your college after 1st year in B.Tech. But you need to give fresh entrance exams after 1 year. Many students do this for IITs. They take admission in any college and persue B.Tech for one year, and after that they again give fresh entrance exams and take admissions in IITs.
All the best
Hope this helps
Candidates can check B.Tech Cut off for Top IITs & NITs here.
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile