Science

You need Biology as compulsory in addition to Physics and Chemistry for admission.

After you graduate, for any job you need to get professional specific skills or knowledge. These 10th and 12th marks will just hold you few extra minutes in interview answering why you got that and why they should hire you in spite of that. The last question matters the most and your professional skills and abilities later determine your worth for job, not 10 or 12.

Most of the central institutions and some state or reputed ones too need you to appear for the entrance exam.

It will approximately charge you 30k as studying expense includes accommodation per sem.

MCA has varied prospects in its own field of Computer applications just like any other degrees or Masters in their own arena. Thing depends on specificity of your strengths.

No, it is not compulsory. You can apply for BBA without mathematics also.

You need to score the minimum scoring marks of PCB combination. In certain situations, your CS will be taken as optional subject and its marks won't be taken in account for biology seats. What you need to do is apply for admission while simultaneously preparing for compartment. By the time of admissions there is high probability that compartment result be declared beforehand.

It is simply studying your course and preparing for entrance in nutshell. So, what you need to do is an honest and dedicated hard work in smartly planned and organised manner. Solving last 10 years question papers never go waste though questions don't repeat. Thing is efficiency in applying knowledge is important which can be achieved by regular revisions.

Government and Private sector jobs are available for graduates in chemical engineering. Government sector jobs, graduates may land job in firms like ONGC, BPCL, DRDO, Indian Oil Corporation, State owned Fertilizer manufacturing units, Food and Drug Department, etc. Talking about the private sector jobs, students may find jobs in sectors like- Petrochemical sector, Petroleum refineries like Reliance and Essar, Cement Factories, Fertilizer Factories, Food Processing and Technology sector, Pharmaceutical sector, Biotechnology Sector, etc.