B.Sc

Big goal, for achieving this you have to first complete your graduation from any recognized university. Then, you have to appear in "Civil Services Examination" conducted by Union public service commission UPSC in every year. UPSC conducts civil services exams in two phase as prelims and Mains, for making as collector you have to qualify both the exams successfully. Good luck.

Both are good at their own place. It depends upon your interest that what course you want to pursue. But, if you go for placement point of view, then you should join B.Sc in aircraft maintenance. There you will get good placement easily. Good luck.

Dear friend,
You can do BS or BS - MS Dual degree or B.Sc from IITs, NITs, IIITs or any reputed university or college. If you want to study abroad, then you can prepare for SAT. There are many branches or subjects that you can choose in your degree. Firstly decide which field of Science is your preference. If you're not able to make a decision, then you are invited to take help of me or any experienced person.