Hello Aspirant !

As you have mentioned Biology , Chemistry and nutrition , there are ample of courses you can do after 12th and at the same get a suitable job in the particular course of your specialization,

Like you can opt , Becoming a doctor for this the course available are :

1. MBBS (BACHELOR OF MEDICINE, BACHELOR OF SURGERY)
2. VETERINARY SCIENCES
3. BAMS (BACHELOR OF AYURVEDA, MEDICINE AND SURGERY)
4. BDS (BACHELOR OF DENTAL SURGERY)

You can also go for Government Jobs for this , you can choose PHARMACY and PHARM D.

You can explore jobs in research field : for this courses are B.Sc. Biology , B.Sc. Chemistry and B.Sc. Health Science and Nutrition.

Hope it helps !