Yes, you are eligible for DU B.Com admission. DU considers only your Class 12 marks and CUET score, not your Class 10 subject-wise results. Your Class 10 Maths fail (E grade) will not affect admission, since your overall result is pass. You just need to clear Class 12 with required subjects and meet the CUET + DU cut-off criteria. So, focus on Class 12 and CUET preparation.