I will keep it short and simple. “ If anything history has taught us, that is, nothing is impossible “ – a famous line from Godfather – 2. I just twisted the last part.
Now, coming to practicality, it is doable but tough. I am assuming, with only 33% passing mark, paper 2 is buried history now. You will cross that easily.
Tricky part is paper 1. With everlasting, non predictable pattern of question paper, which UPSC has been following past half a decade, it is difficult to predict a set pattern of questions. Keeping that in mind, following things to be covered ( this is not exhaustive list, but minimum to be covered, as you have only 2 months) :-
Traditional Geography – Indian Geography from Wizard, Vaziram Geography notes (GS) . Complete the mapping from Neetu singh map marking (Map Marking by Neetu Singhby Neetu Singh.)
Traditional Polity – Laxmikanth
Traditional Economics – Vajiram economy class-notes (http://notesduniya.com/product/item/vajiram-and-ravi-economics-class-notes)
Traditional History – Spectrum, selected topics from NCERT fro Medivial and Ancient.
Go through, chokalingam current affair notes for understanding the broad issues. I personally dont prefer either UPSC & IAS preparation online | UPSC & IAS study material or insightoninida for Prelims.
Join one test series. Get extra paper for practice from market. If you are outside Delhi, search the sftcopy from net for free or better you can get the hard-copy from http://www.notesduniya.com They have started a category, http://notesduniya.com/product/item/vision-ias-mains-test-series-2016 which was earlier available only in Delhi. Give at least 12 tests under strict exam condition. Analyze the previous years papers.
Go for the current affair summation like (Vision PT 365) in last 20 days – try covering Science tech., IR, Govt schemes via current affair. Go through them at-least twice ( keeping in mind, kind of questions asked in 2016).
And on D day, if you are lucky enough, you will conquer.
For all useful study material refer- http://notesduniya.com
Best of luck !!