Civil Servant (IAS/PCS)

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.

Maximum of the best coaching institutes are in Delhi. There, Vajiram and Ravi are the best according to me because they are the oldest institutes and give coaching for Mains, Prelims and Interview as well.

Its great. You can definitely become an IAS officer. But keep reading newspaper daily and also concentrate on current affairs. Also, make it a habit of preparing your own notes.

There is no minimum percentage requirement. You should only have a degree certificate from a recognized institute.That's it. Generally the UPSC board doesn't give preference to academics. Its purely based on marks scored in UPSC exam.

Yes, after cracking UPSC prelims and mains with good marks, you are eligible for personnel interview. As per my knowledge, if you crack the interview, you will be an IAS officer. You have to study very hard for that. Your world should be limited up to you and your studies.
Best of luck.

A search on the net will lead you to many coaching institutes for IAS preparation. Getting a comparative study is also easy now-a-days. I want to tell you about some latest options for coaching. Many people are opting for online coaching classes which are affordable and good. They are conducted by experts so you need not worry about their effectiveness.
For example a visit to a site WizIQ.com will show that there are fifteen different types of courses (https://www.wiziq.com/courses/search.aspx?qry=IAS) available. You will get an idea about their popularity from the number of students taking the course. No harm in exploring.

After completing your class 12th from any stream, you can do your graduation. A civil service exam is conducted for which graduation is the minimum requirement. You can join a coaching to prepare for this exam.