Hi Divya,
As you have not mentioned any particular college so it is little bit difficult to guide you properly.
Generally in Delhi if you go for Delhi University you have to score good enough marks in 10+2 from any recognized board/university or you have to appear for entrance test.
Similarly for IIT Delhi you have to qualify JEE-Main as well as JEE-Advance examination with good marks. Likewise different colleges have different criterias for admission to their college.
I Hope your question has been answered properly.
Good Luck!!
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