Masters

Dear Karishma,
You need to have a MBBS degree with an above average pass percentage and also need to clear the Australian licencing exam, check out the following link https://www.amc.org.au/assessment/pathways/specialist
You would also need to have a high level of English proficency in terms of IELTS equivalent to average 8 bands.

Hi Aman, yes you can opt for a MS in Complete Sc , universities in USA are flexible regarding course choice however since you come from a different backgrounds additional information must be given by you to the University, you must demonstrate your interest and adequate knowledge in computer science, answer questions like why computer science etc. Prepare well for the GRE .TOEFL too would be required.

Hi, a diploma is basically a professional fast track program, good for jobs directly after studies. However you are interested in research then it's a Master's degree you should go for.

Eligibility
In order to be eligible for a Bachelors degree for Zoology, the candidate needs to pass the higher secondary education or 10+2 from a recognized board with Biology, Physics, Chemistry and Mathematics. The duration of the Bachelors course is three years.
In order to be eligible for a Masters Course in Zoology, the candidate needs to have completed their Bachelors course with 50 per cent or above. The duration of the Masters course is two years.

Hi
I suggest you to retake IELTS first or check with various universities for bridge courses in English.Canada will be challenging but you can check University of Alberta, University of Windsor etc.You will have many options in Australia such as RMIT, UTS, etc.

For getting admission into postgraduate course the aspirant has to be a graduate with Science or Arts subjects or can have Bachelors degree in Criminal Justice, psychology or sociology.

Please refer to the link provided below for the list of top colleges which offer courses in criminology and forensic science in Tamil Nadu.
https://www.shiksha.com/humanities-social-sciences/colleges/criminology-colleges-tamil-nadu