I don't know about anyone else, but I think this is really dangerous and will put unnecessary stress on children who are much too young to have to worry about such things. Children learn at different speeds and what a child can or can't do at six has nothing to do with eventual achievement.
With the benefit of hindsight I would advise any mother of a child who is not reading well at six not to worry. Give kids the right type of secure childhood where they can be a child and not a mini adult and they will achieve their potential at their own pace and on their own terms.
The only thing I told my children was that we expected them to do their very best to get 5 GCSE's at Grade C or above, including English, Maths and Science. Anything else would be a bonus.
Daughter - who is now a teacher - got a Grade D in Maths. She had to re-take it to get in Uni, but honestly, what did it matter in the end in the grand scheme of things? Incidentally, she was about eight before she could read out loud fluently.