Hello dear student,
There is nothing like this . They don't ask out of the box questions. It's just that go prepared and give your best.  Everybody's difficulty level is different. May be the course you have done and questions comes out of it then you will find it easy while others difficult. So it's not like that . Don't go into comparing , just try to focus on what you want to do . While go check the bhu's website and check for the syllabus of all these courses. Also check previous year's question papers as you got to do the analysis before you take any step
Best wishes

BHU Varanasi

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