CBSE 12th

Yes, you are eligible.

No, it is not compulsory. You can do BBA even if you didn't take Maths in 12th.

Yes, you have to write cucet exam.

No, not at all. You can go with Biology or even arts subjects. Even its said that Biology is easy to attempt in civil exams than Maths. Good luck.

Candidates from all streams i.e. Arts, Science or Commerce are eligible for admission to Psychology courses. Different colleges/Institutes for psychology courses may have their own set of eligibility criteria. You can take up admission in M.A. Psychology with B.Com degree. Many universities offer this course as a post-graduation subject.

With PCB, you can go for B.Sc. This will give you a great scope and exposure. It is not compulsory to take math.

Maths and economic of class 11th are competitively easier than that of 12th. This is because the 11th class math is basic its a kind of introduction and basics. If your basics are clear and strong class 12th will be application and a quite easier for you.

You can do Diploma degree called as Diploma in pharmacy which is a two years course and then you can become a chemist.

Study in Germany after 12th | Complete Guide for College students
Studying in Germany after completing 12th is best options to start early if you want to study abroad. Here is everything about Study in Germany after 12th.