Can a branch be upgraded in Thapar University Patiala and UIET Chandigarh on the basis of your first year CGPA?

At Thapar University, the branch change does not depend on your CGPA. There is a separate process for the same.

• The 1st year students have to give a December Test by the end of their 1st semester. The syllabus for this test is general class 12 PCM and the subjects covered in the 1st semester.
• A list ranking all the students appearing for this test is made. Based on this list, a counseling session is held to fill in the vacant seats in all the branches.
• In case of a tie, JEE Rank is given preference. 

So, if you are desperate to get your branch changed at Thapar University, all you need to do is prepare well for this particular test.