That is so sad - and you are so right to be concerned. I know 3 parents whose children sound similar to this child. They had their children heavily tutored for 2 years and their out of school lives were dominated by test papers. These children were lovely, but not academic and the parents were very pushy.
The result of this work was failures in the grammar school tests, by a long shot, and 3 very unhappy children, whose confidence and self-esteem must now be very low. She needs to think about her child's needs and not her own need to compete with other parents.
I'm sure she doesn't want her child to be unhappy, but he surely will be, if she continues with this course of action.