Delhi University (DU)

Actually, Delhi University does not really offer a direct BCA (Bachelor of Computer Applications) program to students. However, it provides similar undergraduate courses to B.Sc. (Hons) Computer Science and B.Sc. Program in Computer Science through its various colleges. When it comes to Delhi, SOL it also does not offer the BCA course. 

Yes, you can apply for B.Sc. Computer Science (Hons.) at DU with your commerce background, only if you studied Mathematics in Class 12. 

Subjects you can take in CUET for DU:

1 Language (from CUET List A)

Mathematics or Applied Mathematics

Any two domain subjects from Section II (Computer Science, Physics, Chemistry, or Economics)

If you didn't have Maths or Applied Maths in your 12th class, then you can't choose it in CUET or apply for BMS or BBA at Delhi University. They clearly ask for it as a compulsory subject. Even if you try selecting it in the entrance, it won't count. One option is to take Maths later through something like NIOS and then try next year. But without having it in 12th, you won't be eligible for those courses at DU.