There is nothing like Average student I think However I understand from where you are coming and what you want to say.
Yes, everyone and anyone can do it. the ones who cleared were not born with super brains and they all worked hard and achieved it coping the challenges in their life in their own way.
Do the following
Be consistent
Make a time table
Get good and honest feedback regulalrly
Ask relevant questions
Look for material on the internet.
You don’t necessarily needs to go to coaching in todays world. Gone are those times.
Have positive people around you.
Be self motivated a lot is going to come to you.
Be patient through out the journey
Share your thoughts in the comment section below.
My suggestion for you is that if you are in good college in which the teachers teach good then do your college studies seriously because 50% of the upsc syllabus is cover in college syllabus only..+ You can give some self study time to upsc syllabus like subject which is interesting + simple to read.
And if you are in college which doens't help a lot in your preperation then you can go college only in examination time and then can join some good coaching or fully inclined yourself towards upsc preperation.