Civil Servant (IAS/PCS)

IAS and IPS are Indian Civil services. It is considered as the top most services in Indian government. IAS stands for Indian Administrative Services. This is the qualification prescribed for Officers such as District Collectors, District Magistrates, Additional Secretaries, Chief secretaries etc. An IAS officer will start his career as
Asst. Collector(Trainee) and may reach the top most position of Chief Secretary.
To get IAS, you will have to pass Civil service examination conducted by UPSC. Graduation in any Discipline is the eligibility to apply for civil service. There is age restriction applicable for various castes. For general category , upper age limit is 30, Upper age relaxation of 5 years for SC/ST, 3 Years for OBC and Rtd. Defense personnel etc. available.
There are two parts of civil service examination. First part is prelims which is only screening test. Preliminary is objective test, questions will be from Indian and World History, Indian Constitution, General Knowledge, Current Affairs , Basic English and maths(10th standard level) .
Once you cleared Prelims, you can continue with main examination. Main is descriptive and you can choose any optional subjects from the list. For example,a MBBS Graduate can choose History as his elective subjects. The question will be based on optional topic / subject . Candidates who have passed main are invited for personal interview with UPSC Panel members.
This is crucial, you can expect queries from personal, education, previous employment, current affairs, GK etc. Now candidates are permitted to communicate in their regional language.
After this, you are requested give option for various services such as IAS, IPS,IFS etc. and will get suitable service on the basis of score you have secured . There will be training at Mussory academy and then can join in your cadre

It's a misunderstanding. There are two civil service exams, Preliminary and Main. Prelims is the screening test only and is objective type of examination. Negative marking system is there. The syllabus: - Indian and World History, Current affairs, Basic mathematics and English (10th standard level). Once you clear Prelims, you can continue with mains.
The Mains examination is descriptive type. We have option to choose any subjects from given list. For example, an MBBS graduate who is interested in history can select history as an optional subject. The questions will be based on optional subject.
Commerce and management subjects are in the list. Some other optional subjects are:
1. Engineering
2. Medical
3. Political Science
4. Sociology
5. Public Administration, etc.
So, don't think that civil services is hard for commerce students and easy for arts graduates.
All the best!