I agree its the lack of decent school places available that forces parents into a corner where they feel they have to give their child the best chance of competing for scarce places by tutoring them.
Both my children have had tutoring but neither for common entrance exams. DS1 had a horrible year with a bullying teacher who just screamed at the children all day (yes we and loads of other parents, did complain but to no avail). He regressed, lost his confidence and lost all enthusiasm for school. The 121 tutoring was excellent and he was soon blooming and confident again and has continued with it as he really enjoys those 45 minutes 121 attention each week.
DD has suspected mild dyslexia and I have employed a tutor to give her extra 121 support with letter recognition. She is much younger than most of her classmates and again, this is partly to increase her confidence. She loves her tutoring and her SEN tutor is dfantastic at pinpointing the areas where DD has been struggling and helping her in a way that is patient and fun.
I so strongly feel that we shouldn't have to pay for tutoring (which we can only affiord by making big sacrifices elsewhere), but it is a symptom I feel of having too-large class sizes the constant pressure of sats/inspections/compliance etc etc
We are emigrating, largely due to our dissatisfaction with UK schools and are moving to a rural area where the entire school has only 60 pupils
Excuse the rant but it does seem to me as though education in the UK has become polarised between "failing" schools which don't teach basic grammar and "pushy parent" schools, where parents who can afford it are shelling out for extra tutoring because they are so anxious about the scarcity of decent schools and want to enhance their children's chances of winning one of the few prized places