It is very tough to crack the UPSC exams in the first attempt, but it is not impossible.
One should plan perfectly on the syllabus and for preparing for the Exams.
So many of the young students will follow only Coaching centres. But it is not good.
Revise some other books too, be upto date in GK.
While preparing in rooms and hostels ask your classmates who are attending these exams and prepare in groups.
Discussing in a correct manner is very effective than learning alone.
So many students following social groups for latest questions and updates, but use Facebook and other social groups to a limit, otherwise you will divert from the studies to other things.
Study at least 8 hours everyday! Just make a commitment to do 8 hours daily.
If you join Coaching centres please attend classes regularly.
Attempt some online tests so that you will gain good time management which is very important in the exam context.
Above all Self confidence is very important.