hello aspirant,
university of delhi ,admission will be offered through merit of qualifying exam or entrance exam
yes, DU organises various entrance exams to offer admission to the students.
yes,  regarding b.com there is an entrance exam and for that exam, application form is released from 3rd week of may 2019.
for further information,  go through below link https://www.google.com/amp/s/university.careers360.com/articles/du-bcom-eligibility-criteria/amp
thank you

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