M.Sc

Yes, you can do M.Sc in environmental management in FIR Dehradun after completing your graduation. The scopes of Environmental Science is limited at present in India, but is going to see a plunge in the near future. As you know, almost in all the sectors, Environmental Protection is given emphasis, hence Environmental Science graduates have a bigger scope. But, as of now, the main problem is that the job that should be done by Environmental Post graduates are being done by students of Chemistry, Forestry, Agriculture, Botany etc. This is causing a stiff competition for Env. Science students.

https://www.google.com/amp/s/www.shiksha.com/b-tech/course/amp/b-e-in-food-technology-panjab-university-chandigarh-14161
I hope the link helps.

Yes, that is the right thing. You have done to be eligible to Apply for M.Sc. Geog. Either Regular or Distance Learning, a Post Graduation is possible in a subject you have studied in Graduation. Go ahead!

https://www.google.com/amp/s/www.shiksha.com/science/course/amp/m-sc-in-forensic-science-guru-gobind-singh-indraprastha-university-dwarka-Delhi-273995
Hope the link to you

Yes, after completing your graduation from Mumbai University, you can go in any country for higher education. You are eligible for MS CS in Germany or other EU countries. You can get admission there.
Good luck.

There is a super placement in Loyola College. There are 98% students which was placed in the major companies in previous year, TCL, Lenovo, Hero, Honda, etc. here is an average package is 20,000inr.

Yes, you can definitely apply for M.Sc Statistics if you have completed B.Sc computer science. On the basis of your marks, you will get admission.
Best of luck for your future and if there is any query, feel free to ask.