which has most job opportunities in abroad ba wnglish or bsc biotechnology or bsc microbiology or bca

All course are evrey good, it is a great choice , you can go for any of course you have more interest.

For BA in english jobs are
Teachers.

Content Writers.

Retail Assistant's.

Customer Service Manager.

Tourist Guide.

English Translator.

English Tutor.

Bsc in biotechnology jobs in abroad but it's more smooth if you do your Master

Research Methods: Communication Skills

Introductory Molecular Biology

Stem Cell Biology

Tissue Engineering

Fermentation / Bioreactors

Cell Culture

Protein Engineering & Production

Enzyme Technology

Bioinformatics

Research Project

Biotechnology and Management

Environmental Biotechnology

Bioscience

Food Biotechnology

Biomedical

Pharmaceutical science

Bsc in microbiology jobs are in abroad
But you can get more opportunities if you do your Masters
Research Assistant.

Food, Industrial or Environmental Microbiologists.

Quality Assurance Technologists.

Sales or Technical Representative.

Clinical and Veterinary Microbiologists.

Medical Technologists.

Biomedical Scientist.

Clinical Research Associate

For boost up your study and get a better opportunity job you can visit here
https://www.careers360.com/articles/study-abroad-countries-courses-tests-visas-more

Thank you. I hope this answer helps you .