Science

You can do PG in mechanical engineering from these colleges;
Durham College
George Brown College
Sheridan College
Algonquin College
Humber College
Seneca College
Centennial College of Applied Arts and Technology
Confederation College of Applied Arts and Technology.

In my opinion if you pursue M.Sc from a good reputed university where placements are offered and if you have skill then you can definitely get a job in a pharmaceutical company. Currently the pharmaceutical sector is on boom.

Choose what you love. Also look at the curriculum and the university. Pursue career in microbiology only if you get admission in a good and prestigious institute. Zoology is a core subject and hence offers a wide range of career opportunities whereas microbiology is an specific course. Although ther

JIS University, SRM University, Tamil Nadu Agricultural University, Mahatma Phule Krishi Vidyapeeth, Bisra Agricultural University, Khalsa College etc.

Woxsen University, New Horizon College of Engineering, BML Munjal University, BITS Pilani etc.

Amity University, Banasthali Vidyapith, University of Rajasthan, Jaipur National University etc.

Mount Carmel College, Kristu Jayanti College, Reva University, Dayananda Sagar University etc.

Refer the following:
Dr DY Patil University, Tilak Ayurved Mahavidyalaya, Bharati Vidyapeeth, Yashwant Ayurvedic College etc.