Hello Nitish,
In BPSC Exam all subjects are equally easy and equally hard depends upon person to person.It depends in which subject you have interest more.if you have a interest in History then sure you should take history optional to score well. Your intrest in a particular subject makes it easy or hard for you .
I will advice you not to go for the things like easy and hard . You should work hard for each and every subject of your syllabus to clear out the enterance exam.
Hope it helps.
Thank you :)
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