B.Sc Preparation

This is a very dicy question. College level studies are very different from school studies. A lot keeps on happening in the college and at time it's very hard to resist. If you are firm and resilient enough, you can certainly manage it. Just keep a track on both the sides. Give a lot of importance to self study. Also, don't miss out the college life as it will never come back.

For civil engineering, you must have a good knowledge of mechanics. So, you must opt for physics and mathematics. In addition, for concrete technology, you need some knowledge of chemistry. If you are interested in subjects such as biology and chemistry, you can go for environmental engineering which is a sub-branch of civil engineering. In summary, you are expected to have a good knowledge of mathematics (mainly differentiation, integration and binomial theorem) and physics (mechanics, elasticity, circular motion, Newton's laws of motion, etc. ).

There is no particular subject for IAS. But, B.Sc, or BBA should be the choice. But again, you should have a backup plan. If you see according to backup plan then B.Tech will be the best. It all depends upon your interest.

I think you can pursue M.Sc. After you complete your graduation and later on Ph.D and then you can expect a respected position in any institute or in any other good university in the teaching field. Also, if you want, you can pursue MBA after your B.Sc. If you are interested in the management field.

Hi!
You can refer https://www.shiksha.com/b-tech/kiitee-exam-question-papers

Hello Aman,
It's highly dependent upon your aspiration.
B.Tech is best for those who aspiring to become IES service. B.A. Political Science/History is best for IAS. B.Sc forensic science/chemistry is best for forensic science services. B.A. English/Economics/Foreign trades are well suit to IFS services. These are not only eligibility criterias (except IAS, IFS, Customs, Other services) these are the step stones that make you to lead others easily and these subjects are already learnt by you at school level and you have the basic knowledge.

No, this option is not available in any university.

You can find previous year questions in Arihant etc. Books, The syllabus can be found at:
https://www.jmi.ac.in/studyatjamia/Syllabi/entrancetest.

Of course, you only need a degree. Prepare well for CAT and interview. Best wishes.

All you have to do is manage your time likewise. You should maintain a balance between both of them. Pay proper attention to the course curriculum in the college and invest rest of the time in the IAS preparations. If you are taking coaching for that, then it might be more difficult because of the timings. Try if you can adjust without them or try to get into weekend courses. This might be exhausting times of your life, but believe me, the result will be as good.