I hate to say it, but it will vary each year depending on the cohort and how difficult the exam is. I know I'm not being very helpful and I'm sure someone will know more than me, but if you look in the Bucks section there is some historical data on scores needed to get 121 by month. I don't know how this relates to 111 in Berks. It is usually said on the Bucks forum that you need to be scoring 90% in practice to be fairly sure of passing (passmark is lower, but gives you a margin for errors on the day). I presume you have searched through the Berks section for similar information?
I found this:viewtopic.php?f=10&t=25072