Hi, this is the second question that we are breaking down asked by the random or say unknown person. This kind of question must be answered by someone, so "I am the choosen one" Oh just kidding.
So, you have decided to take a part in this league the UPSC, right. Don't worry you are going to get through each and every problem. I hope for it.
If you want to start from scratch or might you have started preparing a long ago, but according to your question you just want to prepare for your optional for the UPSC.
Yes you can start from where you are. There is saying "something better than nothing ". So, start it right aways because by the time you will not have any time to think about yourself even. If you start preparing in the graduation days this kind of pavement for your way amongst the other competitor (upsc aspirants) but you also need to give time your study too. If it is not giving you any pressure while preparing for the other subjects a part from your curriculum then you are on right path. Go ahead.
Hope you like this short answer.
if you have any doubts, let us know