Hi

UPSC eligibility criteria says that

*You must have a bachelor's degree in any discipline   from a recognised university

* Candidates who are in the final year of your graduation or waiting for the final results are also eligible to apply for UPSC examination and can appear in UPSC prelims examination but yes they need to present proof of their Bachelor's certificate before UPSC prelims examination.

Now,

you are doing BE i. e Bachelor in Engineering which is a four year long course and you are still in the third year i. e not in your final year and thus you cannot apply for your UPSC examination now but you can definitely apply for it in your final year or 4th year of your Engineering or after completing your BE

*Minimum age limit :-  you need to be at least 21 years old to be eligible

*Maximum age limit :-  32 years , also there's 3 year relaxation on upper age limit for obc and of 5 years for sc/st category

For detailed information about upsc eligibility go through

https://competition.careers360.com/articles/upsc-ias-eligibility-criteria/amp

UPSC, has 3 stages which are listed below :-

*The first stage of the exam is Preliminary examination (objective )

*The second stage, Mains (written).

*If you manage to clear both prelims and mains then you are to go through third stage i.e interview/personality test .

Prelims syllabus

It has two papers -
*General Studies Paper I and
*General Studies Paper-II.

Syllabus is :-

*Indian Polity,
*History,
*Indian Economy,
*Science and Technology,
*Environment and Ecology,
*International Relations and associated current affairs etc.

Similarly , you can get complete Syllabus of UPSC for both prelims and Mains examination by going to our page, the link is given below

https://competition.careers360.com/articles/upsc-ias-syllabus

Thank you