How to become an Information Specialist through UPSC exams? Give the complete information regarding same.

If one from library & information science background want to become a information specialist to any recognize institution through UPSC exam then what is the way out
He/She is Hons Grad in Physics and Masters in Library & Information Science.
when would be the date of exam
How would be the procedure for selection
How one get prepared himself/herself for this exam
what is the difference between PSC & UPSC exam
in which sector does it belongs
state government or central government?
how he/she can join any scientific organisation or special libraries or research organisation as a Information Specialist or Information Officer
what would be their job profile
how much time they have to spend in work area?

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