Civil Servant (IAS/PCS)

Yes you can. You are required to prepare for civil services exams. Start at the earliest. Do graduation from any discipline as that would be the minimum eligibility for the exams.

All the career options in your query are diverse and have its own pros and cons. It will be better, if you choose your career based on your interests and long term goals to excel in career.

You can prepare for UPSC exams after completing your graduation and it will lead you to district magistrate i.e. collector.

Hello,
If you have completed your graduation from a good college, then you are eligible for most of the government job competitive exams like - IBPS, SSC CGL, IAS exam, etc.
So, you can start your preparation for the exams.
You can visit the below mentioned link to prepare for SSC CGL exam:
https://www.eduncle.com/ssc-cgl-recruitment-exam
Best of luck.

B.Sc IT graduates are eligible for appearing in civil services examination.

First, refer to the NCERT textbooks. After that, join a good coaching institute.

Any civil service aspirant should keep a backup plan in mind. Qualifying in this kind of exams is not certain and after few years of preparation, one finds that other options are not available. So, first and foremost keep some alternative career choices in mind.
Preparation for the exam should be done in a structured way and one should consult and keep himself up to date with recent topics. One way is to go for a coaching.
You can opt for online coaching too. You can visit the below mentioned link:
https://www.wiziq.com/courses/search.aspx?qry=IAS

Public service commission:
Every state has its own public service commission. They conduct PCs exams for posts like Joint collector, MRO, ACP and many more state level top government jobs. Generally, students who don't secure a good rank in civil services exam can try for PCS exam. But, the post with which you will retire in PCS, will be your starting post in civil services.

Anyone can appear for UPSC irrespective of which college he/she is studying in.
The only thing is that you must have a degree certificate from a recognized institute.

It depends upon our interest. IT field do not have government jobs, so we must choose the best from private institutions only. Government jobs do not have job risks, but private has very high job risks.
After retirement also, there is a scope. You get pension facility. It is totally opposite in the case of private jobs. But yes, the salary is high in private jobs in comparison with government jobs.