CA

Actuarial science: It consists of 15 papers and most of them have universal applicability. The difficulty level of actuarial science can probably be known from the fact that number of actuaries in India is just around 200. The main subjects included are mathematics and statistics.
CA: It has four groups and four paper for each group. Three years long articleship after 2 groups. First two groups are considered easy, while the 3rd and 4th one can pose some challenge. The groups can be given at 6 months gap. After articleship, you get time to prepare for 3rd and 4th group.

CA or CS offers equal career prospects to all aspirants. As financial sector is concerned, you can prefer CA. After qualifying CA, you can have some paper relaxations while pursuing CS. According to your future career requirement, you can pursue CS after qualifying CA. For more details and procedures, kindly visit the website of ICAI.

Hi Rahul,
CA job prospects are very good in Dubai. ICAI has it's a Dubai Chapter so and this is a plus point. CA salaries are is quite high. Having work experience will help you gain better salary and negotiate because quite obviously you have the experience and skills. This is a very simple logic. For more information check this:
http://www.icaidubai.org/

You are advised to BA Economics. It will help you in clearing civil services examination and will help in your career as civil servant.

MBA is my choice in your options but go for your interest.

Yes, the quota for admission in B.Com is available in Delhi. But CA is not done from a college or university. It is pursued by registering for exams from the Institute of Chartered Accountant in India. You just need to join a coaching class for its preparation.