CBSE 10th

Yes, you are eligible to get admission. Candidates who scored above 80% are eligible to get admission.

Yes you can expect a call from IIM Ahmedabad because your percentile is too good so I am assuring that you will get at a call with from IIM Ahembdad. Your cat score is excellent but you have to pass the personal interview also to have admission in IIM ahembdad.

Yes, you can enroll in B.A. And you will get admitted to second year directly if you are holding a Diploma in Polytechnic.

You must have to clear CAT entrance exam with good percentile first.

No, onlyafter class 12th you can pursue this course and M.A. English is an post graduate course you would to do B.A. In English to do so prior to this.

Yes, you can get and you will definitely get the college.

Yes, of course, you can appear in UPSC civil services exam, the only condition is-:
Candidate must hold a Graduate Degree from a recognised University. UPSC Civil Services Exam Age Limit: Candidate must be a minimum of 21 years of age and must not be more than 32 years of age.
General Category
No matt

No the marks of class 12th is considerable. 60% in the CAT exam.

When you are thinking of writing the IPMAT exam. Then class 10th score will matter. Otherwise, for CAT it is not considerable.