Can I change my branch from biotechnology to CSE in Heritage Institute of Technology after the 1st year?

It's amazing that you're a HITK student, my brother was one too and his friend and his colleague's daughter as well. Coming back to your question, yes, you can change your stream in the first year. 

Build a CGPA of 8.5 or above to apply. You will become eligible for application. You can then easily apply for a change of stream. 

You may get disappointed when the administration tells you that the seat will be allotted on the basis of availability. The higher your score, the greater are the chances- they will hint at this as well, but don't lose hope because they will have a seat for you.