Dear aspirant,

Based on your percentage, there are various colleges you can apply to under University of Delhi. If you had science in your class 12 and wish to pursue science courses in college, you will have to calculate your best of three subjects to seek admission. If you had humanities or commerce in your class 12, you will have to calculate your best of four subjects marks and then gauge whether you can get admission based on the cutoffs released by the university. However, if you wish to change your stream (eg., Science to Commerce or Science to Humanities), you should note that 2.5% marks will be deducted from your marks.
Also, to seek admission to University of Delhi, you first need to fill out the application form where you have to upload your basic information (Name, Age, Gender, etc.), the marks that you have obtained in your class 12 and as you belong to the SC category, your caste certificate. For certain courses like BBA etc, you will be required to give an entrance exam which can opted for in the application for itself. As soon as the university releases the cutoffs, you can check whether you lie in that cutoff and apply to the courses and colleges available.
If you wish to know your chances at admission into the university, I suggest that you use the link below to check the link given below which includes the previous years cutoff for various courses.

DU Cut Off 2021, 2020, 2019: Arts, Commerce, Science Cutoff List PDF (careers360.com)

If you still have some doubts regarding the admissions, I request you to check the link provided below which includes all the information regarding admissions at University of Delhi.

DU Admission 2021 - Cut Off Dates (By October 1), Application Form (careers360.com)

Hope this helps!