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You can go for an MPhil (regular) after completing Masters from IGNOU. Every institution has its own criteria but since IGNOU being the recognized Open University, its degree is acceptable by almost all other regular institutions.
Recently, UGC has announced that candidates who score 55% in their Masters are eligible for MPhil from UGC recognized universities. So you need to focus on getting at-least 60% in Masters to be in the safe zone (Only if you are a general candidate).
I would like to give you an advice that please go for Central Universities for M.Phil as the faculty in such universities is mind blowing. JNU, DU, BHU, etc. are there in this list.

Hi,
Eligibility for M.Sc in forensic sciences:
Minimum eligibility criteria for M.Sc. in Forensic Science course may vary across institutes. Primarily, the criteria include:
Bachelor's degree in science/ engineering / pharmacy/ medicine, obtained from a recognized university.
A minimum aggregate score of 60% at the level of graduation.
M.Sc. in Forensic Sciences: Admission Process
The merit list for admission to the course is usually prepared on the basis of the candidates' performance in a relevant qualifying examination and entrance exam. General weightage is given to both the score obtained in the entrance exam, and to the score obtained in the last qualifying examination.
The round of written test is often followed by subsequent rounds of Group Discussion and Personal Interview.