Distance/Correspondence M.Sc. in Science Colleges in Bangalore

Yes, you can acquire knowledge at a higher level than what you studied during your bachelor's degree, and the course will help you develop the necessary skills for your field of work. After getting a postgraduate qualification on your resume, grabbing a good graduate job is easier which provides a good salary as well. Eligibility criteria for pursuing M.Sc forensic Science in most of the top universities is pass with 60% aggregate marks in B.Sc. (Forensic Science or Biology or Physics or Chemistry or Biochemistry or Microbiology or Biotechnology) or B. Pharm. or MBBS or BDS or BHMS and you might have to qualify some entrance test depending upon the university you choose.
Medical examiners' offices, Crime laboratories, Police departments, Hospital, and chemical laboratories, teaching at Different forensic Science institutes, Prosecution attorneys and criminal defense, Pharmaceutical industries, - can be considered a few of the career paths you can go for. 

While some Forensic Science Colleges offer Forensic Science admission on a merit basis, other colleges require students to take Forensic Science Entrance such as CUET, CUET-PG,  JEE MAIN, GPAT,  MHT CET etc.

They both have different spans. Criminology is more related to law and criminal proceedings and M.Sc. Forensic Science is an application of all sciences to help in criminal investigation, like the collection and analysis of evidence.