Hello !
Here are few courses or lines you can choose as a Biology student :-
1.Medical Sciences -Being a Biology student,you can opt for medical sciences.
You have to appear NEET to become a doctor.
2.BSc in Biological Sciences- You can choose BSc with Botany/Zoology/Biotechnology courses as honors.
Some of the best colleges to purse BSc with Biology are
i.University of Delhi
ii.BHU
iii.Utkal University,Odisha
iv.Ravenshaw Univeristy,Odisha
V.OUAT,Odisha

3.ICAR- You can apply for ICAR UG entrance exam. ICAR is one of the best platforms for Biology students to pursue their careers in Agriculture and allied Sciences.ICAR hosts multiple number of colleges throughout India.Out of which IARI,BHU and OUAT are the best institutions.

4.NISER- This is a research institute for various disciples.Biology is a popular branch in NISER. You have to appear NEST to get a seat in one of the NISERs.

Hope this helps !

For 12 biology student there r a lot of courses u can opt for like if u have given neet exam so u can apply for ayush courses ( BHMS, BAMS, BNYS, BUNS) nd if not neet so u can go for B pharma , BPT these r the courses which r good nd has a better scope nt choose the course according to ur interest only..

Good luck!