Biju Patnaik University of Technology

No, this is not mandatory that only candidates from Odisha can take admission in government college of engineering.

Please check on important application dates for M.sc physics. Admissions are now closed in most colleges. You can prepare to apply for the next year. However, there might be a few colleges which are still accepting students in their science courses.
B.Sc.(Genl.)/B.Sc. (Pass) (3 Years course after 10+2) with 60% or above marks in the aggregate and 60% or above marks in Physics. from Delhi University or any other University whose Examination is recognized as equivalent to Delhi University and fulfil other conditions of eligibility.

You should prepare well for campus placements, Prepare for Aptitude questions from RS Agarwal for Quantitative aptitude. Your MBA Finance books should be well versed for technical interview.