During Post utme Admission screening exercise, the institution would ask for your o level result when submitting their credentials in other to admit them with these criteria.
Our response to them was that any institution that accepts two sittings will allow you to combine your WAEC and NECO results together.
Some candidates go ahead and said only WAEC-WAEC and NECO-NECO goes hand in hand. But we told them that they are missing it. WAEC-WAEC combination works, NECO-NECO combination works, so also WAEC-NECO combination. If you pass the subject(s) you failed in WAEC in NECO and vice versa, be happy! You can combine the two results together. Any institution that accepts two sittings will reckon with it.