Hi

What do you mean by b group? Did you mean Biology group? Your profile suggests that you are a medicine aspirant so I am guessing that you are asking for courses after 12th Biology group

There are a number of courses after your 12th PCB group or  biology group but which course will be good  for you and you should go for depends upon following factors

*Your interest
*What do you want to become,

For example, if you want to become a doctor you will have to do mbbs , if you want to be a journalist , then you will have to do bachelors in journalism, if you want to be a Lawyer you will have to do LLB

After 12th science stream , bio group , you can go for following top courses for your graduation depending upon your interest:-

*MBBS.
*BDS.
*BAMS
*BHMS
*Bachelor of Veterinary Science & Animal Husbandry
*Bsc Nursing
*Bsc agriculture
*BSc biotechnology
*B Pharma
*Bachelor of Physiotherapy.
*Paramedical courses
*BSc dairy technology
*Bioengineering
*BSc. Medical Laboratory Technology
*BSc. Cardiac Laboratory Technology
*BSc. Dialysis Technology
*BSc. Neuro Technology
*BSc. Nuclear Medicine Technology
*BSc. Operation Theatre Technology
*BSc. Perfusion Technology
*BSc. Radiotherapy Technology
*BASLP (Bachelor in Audiology & Speech Language Pathology)
*Bsc zoology/chemistry
* 5 year LLB

So , take your time and depending upon above aforesaid  factors, you can make a choice of course for yourself

For more courses go through

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

Thank you