B.Com

Yes, you can apply.

Yes, you can apply for CAT, MAT, XAT and other MBA entrance exams after completing B.Com.

After completing B.Com, you can pursue an MBA in marketing, retail management, finance, human resource management, IT, banking, insurance, logistics and supply chain management, international business and operations management.
You can also opt for a professional course like CA. The Institute of Chartered Accountants of India regulates the profession of chartered accountants. The course involves professional competence course, articled/ audit training, information technology training and final examination.
You can also pursue ICWA or company secretary course. You can go for Masters in finance and control or M.Com.

Some courses are:
Chartered Accountant (CA)
Masters of Commerce (M.Com)
Masters of Business Administration (MBA in Finance)
Certified Management Accountant (CMA)
Certified Public Accounting (CPA)
Association of Chartered Certified Accountants (ACCA)
Business Accounting and Taxation (BAT)

Some courses are:
Chartered Accountant (CA)
Masters of Commerce (M.Com)
Masters of Business Administration (MBA in Finance)
Certified Management Accountant (CMA)
Certified Public Accounting (CPA)
Association of Chartered Certified Accountants (ACCA)
Business Accounting and Taxation (BAT)

The general eligibility criterion for an air hostess in a majority of airlines is as follows:
(a) 10+2 pass from a recognized board of education. Some airlines prefer graduates.
(b) Age of candidate should be between 18 to 25 years
(c) Min. height required is 157.5 cm and weight should be in proportion to height
(d) Good communication skills with mastery over spoken Hindi, English. Foreign language certification will be a good additional qualification.
In case you fit well in all these requirements then you can give this a try.

I would suggest you to choose a field in which you want to make a career. You can select the best companies and try for a job.

Yes, you can do that. Mathematics is not required.