Hey there.
It is a fact that major weightage in IAS EXAMINATION is of subjects related to Arts. Specefically - History Political Science Economy Geography environment. And then ofcourse there are optional which has multiple subject including PCB.
if you want to initiate your preparation at an early stage then I might suggest you focus more on humanities as there is a larger scope of understanding things from the examination perspective.
Another thing is that 40 percent of engineering students are usually being selected in the contemporary times so this counters my argument. But still they have a hard time adapting to humanities subject in the beginning.
So to be absolutely sure about your chances of atleast getting used to the pattern of Upsc that is social mostly you must Opt For B.A with subject's of your choice.
This would be my personal suggestions.
If you wish to continue with your subjects then also there is no hurdle that can stop you.
Hope this helps.
Best of luck

Army Institute of Management, Kolkata

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