hey gulshan!

since you were a student of science stream so it must be noted that changing stream can deduce percentage . if you are a science student and want to pursue BA from du so about 2.5 to 5 % can be deducted from your overall percentage .so by taking this into consideration

now as you do not mentioned the subject from which you want to pursue BA so i cannot tell the exact answers but yes there is a good chance of getting admissions in du

check out the last year cutoff

http://www.du.ac.in/cut-off.html

best of luck