Hello Rohan Kapoor,

Congratulations for your marks in class 12th, you really performed well.

To know your chances of converting Delhi University Colleges for b.com you can visit the following link.

Also there are many college and university provide b.com course like

IP University(including 60+ colleges)

Bennett University

Amity University

IILM University

As your scored 90% in class 12th, try to join Delhi University first and I hope you will definitely convert a college for b.com.

To know admission process in Delhi University, go on following link.

https://university.careers360.com/articles/du-admission

Hope this information would be helpful for you.

All the best.