For branch change from mining to MNC in IIT BHU, one needs to consider the following points.
As per the policy, a student of a 4-year program(Btech) can get his branch changed to a 4-year program(Btech) only and a student of a 5-year program(IDD) can get his branch changed to a 5-year program(IDD) only. Considering this, you cannot get your branch changed to MNC unless you are in a 5-year program (IDD) at IIT-BHU mining. IIT BHU offers only an IDD program in Mathematics and Computing.
Another branch change policy states that the total intake of a branch during branch change should be 10% of the total batch strength. Now, Maths and Computing have very few students, only around 20-25. This means only 2 students can get their branch changed into MNC. This results in tough competition and one has to score at least 9.7 CPI to be eligible for branch change.