Civil Servant (IAS/PCS)

You have to show a consistent academic performance for a good future. You have to get a first class throughout your career. So, work for it now. You need to take care of your academics. There is no separate preparation for IAS.

It depends on your dedication, but on an average 2 to 3 years are more than sufficient for IAS.

Yes, you can prepare for UPSC after completing B.Sc.

IAS implies hard work with all sincerity. So, estimate your capacity for hard work. If you are satisfied with yourself, you are bound to succeed. Your desire for quality matters more. All other things come automatically. How many man-hours can you spend at a stretch? If you're confident with yourself, you will find a methodology soon.

No, there is no added advantage.

It depends on your interest. IAS will give you the prestige and a chance to serve billions of Indians. MBBS will give you the chance to heal one's life.

Which branch do you have? You have to appear for UPSC exam.

Yes, according to 7 grade pay scale the salary for cabinet secretary is Rs.2.5 lakhs per month. Cabinet secretary is the highest post in IAS and also you will get a government car and house.