I had the occassion at one time when I was in early awaitng for my class to start,while I was walking around the lab I overheard a student telling another student he was going to quit because ther was no way he would be able to pass the practical exam he wasgoing to take in a couple of days.I question him as to why he felt this way and he simply said I know I cant do it. after going through the steps of what would be required I said you have nothing to loose if you attempt the exam if you feel that strongly about leaving. Probably not the best approach,but he did attemp the exam and did very well i the 80% range.He decided to continue his Education and graduated a year later.This student is working in his field of study today.