Class 12-science

Well, if you love to draw and wish to pursue a course in science stream as a professional course then you should opt for B.Arch.

Well, you have various courses to opt other than engineering.
Check the following link for some science courses offered by DU for undergraduates:
http://www.du.ac.in/du/index.php?page=old-undergraduate-courses

For becoming a zoologist, you have to first complete 10+2 with PCB subject then you can take a Bachelors course in zoology.

This is not a big problem. I got just 71 marks in maths and 86% in 10th. After getting low marks, l took PCM in 11th because I wanted to become an engineer. I practiced to improve my maths consistently and now I'm one of the toppers in my class. You can improve your strength in maths.

Also,if you got under 100 rank you can and get 100% scholarship in tuition fees.

You can take up B.Com or B.Sc. It totally depends on your interest. After your graduation, you can apply for IBPS exam. Hope my answer helps you in future.

If maths is your favorite then after 12th, you might opt for one of the two options either you can do graduation in maths or choose to be an engineer with mathematical and instrumentation as your trade.

It actually depends on what profile you are targeting. Not every profile requires B.Sc in aviation.

After doing 12th with physics and maths, you can go to any pilot training school to pursue your career as a pilot.

After completing your 12th, you can opt for anything. There are no boundaries for you can go in commerce as well in arts field. Good luck for your future.