Class 12-science

See, firstly, your scores in class 10 and class 11 need to be really good to be eligible for science stream. But secondly, all depends on school admissions to take the final call. Discuss this matter with school authorities.
This is a very riskydecision as without studying sciencec n class 11 - it is difficult to score well in class 12. And if you think you are not comfortable with commerce you can think about shifting to humanities.

You have following options to pursue a career as a programmer:
(a) B.Tech CSE or IT
(b) BCA
(c) B.Sc CS or IT
(d) Diploma in CASE
(e) Short courses on Programming from computer training institutes.
B.Tech CSE is the best option among recommended paths.

There are so many courses in B.Sc or BA, you can choose any subject which ever you like. There are many without maths and biology. Go for chemistry then.

Well, in that case, you could pursue a career in biology.
One of the 1st things that come in our mind hearing career in biology is medical. It is a good career option especially if you have determination and will for medical stream.
Other options for you could be -
Dentistry
Veterinarian
Biotech
Pharmacy
Agriculture
Bioengineering
I would suggest you to firstly understand your interests and try to focus in that field.

Engineering is one option, you can also look for MBBS/BDS or other medical fields. You can also go for Bachelors in subjects like Zoology, Botany, Chemistry, Physics, Maths. At the end its your field of interest which specialisation to choose.

Check out for its minimum cut-off first. If you are eligible then don't miss the chance.

Hi,
You can join these courses after completing your class 12th:
Most popular courses as given below:
Engineering
Maths / Statistics / Physics / Chemistry Honors
Forensic Science
Actuarial Science
BA LLB/ BBA LLB/ B.COM LLB
Nanotechnology
B.Pharma
Economics Hons
Architecture
Environmental Sciences
Agriculture
Psychology
Actuarial Science
CA/ CS
You may also do these courses after 12th according to your interest:
BA Fashion Communication
Journalism and mass communication
Hotel Management
Fashion Designing
English Honors
Foreign Language
Special Education
Travel and Tourism
Physical Education
Management
Fine Arts / Animation

Yes, you can but only if you are capable of handling that amount of pressure. Both maths and biology are equally tough with vast syllabuses. They will open a lot of opportunities for you in future.

Hi,
As per your interest in entrepreneurship, you should watch Shark Tank and The Vault online series that give you knowledge about the entrepreneurship skills and foundation. Even you can watch TED talk.
To set a business, there is no specific degree required. But, you can consider BBA program as you would get the knowledge related to marketing strategy, business management, finance management, etc.
All the best.