Yes,you can change your college after completing your first year but there are chances where you should again repeat your first year in your new college and it depends on the college you are moving to.And since you are changing from one autonomous to other,obtaining a migration certificate from your previous college would be difficult.In some cases,you will need to approach the education council of your state.And your previous college may even ask you to pay the entire fee of 4 years.So,plan accordingly and make your decisions.All the best!!