I have always counted my son down with halfway, 10 mins,5 mins and 1minute warnings. At the beginning I would lie
and add 5mins without him knowing, gradually reducing this. He can now finish a 100 word paper in under 43 mins,usually scoring well.Any words he has struggled with we discuss at a later time when he is feeling ready. I also tell him how hard I thought those papers were so that his confidence stays high
We are now doing 2 papers a week back to back with a 15 min break so that he gets used to concentrating for a long time.
He also spends 20mins a day looking up and learning new words that his tutor sets him so his vocab is improving every day.
I still cant get him to leave the long questions untill last though