Hii Tarun

With 50 percentage in class 12th boards examinations you are very much a below average student and this much percentage is not enough to get a college in the Delhi university even if you belong to the scehdule caste cateogory. You can get a college though it is difficult with this much percentage.Please wait for the delhi university to release their cutoffs on their official website.
You can reach out to us for more information regarding anything related to admissions process, important dates, cutoffs etc.
Hope it helps
Thanks