Hi Shivani.

There's no subject that can be termed as best or tagged as worst. Each subject comes with its own challenges and uniqueness. Though there can be a subject that can be best for you. And that is something only you can know and you should decide.

Some of the specializations you could consider doing B. Sc. (Hons) in are :

Microbiology

Zoology

Geology

Forensic Science

Food Science

Hope it helps.