Hello,

The eligibility for Bsc zoology is to have 10+2 and Physics,  chemisty and biology as your subjects. So unfortunately you cannot do Bsc zoology because you are a commerce student and does not fulfil criteria. But do not worry you have many opportunities in your commerce field too. If you have completed your B com then go for MBA or give some government exams. All the best and thank you so much.

https://school.careers360.com/articles/courses-after-12th-in-commerce/amp

https://www.careers360.com/articles/4969-Career-review-commerce