Not sure how helpful this is. But.
To concentrate I count. Yes I count my score. So I know what I'm on at any given stage(barely wrong either)
I used to get nervous past 80, start trying to reel the shots in, look for bad balls and always ended up getting out in a manner that didn't suit me.
So I said to myself, if I get passed 75, I'm just going to smash everything.
And granted its worked....... on 3 occasions, and failed on many others (I've got out on 85, 7 times!! My bogey number).
I know many a batsmen that suffer from nerves near it to, and refuse to be told or know what there on. Played at sewerby once when a lad got 104*, from about 35 on he refused to look at the scoreboard/pavilion and kept standing with his back towards it, and if he played a shot near it, kept saying "your call I ain't looking"