Hello,
If you need a seat in biomedical engineering, the closing rank for last year is 15793
If you need a seat in civil engineering, the closing rank for last year is 4496
If you need a seat in computer science engineering, the closing rank for last year is 4393
If you need a seat in ECE, the closing rank for last year is 1907
If you need a seat in EEE, the closing rank for last year is 4445
If you need a seat in Mechanical engineering, the closing rank for last year is 6217
If you have a rank somewhere around the ranks mentioned above, then you will most probably able to get a seat in your desired branch at OU.