I've posted on hear since about Year 2 for DD1 out of desperation to help her learn (maths & reading particularly week - scored NC L1 at KS1 Sats) and catch up with her peers (not just at school - but friends from nursery clearly streets ahead of her).
We've achieved that but it has been at a price - total loss of respect for the school and English education system in general. I won't go over again all the problems - but I did go to the school first and express our concern about inability to add/ subtract or read well and asked for advice on what we could do at home. My husband and I were treated appalling by the school and pretty well left to it.
When you're battling to have division taught or to get more than one book every three weeks - and I mean battling - you feel nothing but despair.
My DD1 has a pushy so and so for a Mum who wouldn't take 'you're too ambitious/ demanding' for an answer - and went out and got resources to help my child get to where she should be notionally as a good primary student. She's not a high flyer (failing to gain a place in local free grammar schools by ~8 pts) but she is on target for L5 at KS2 SATs and will be put forward for L6 papers.
We've achieved this educational outcome at home, through on-line maths tutorials (thank you Mathsfactor!) and regular reading together. DD1 has also benefited from DH & I asking/ researching/ reading around what children should be doing in particular years (Thank you TES/ Guardian professional/ MN/ etc...). DH and I both work and frankly it is ridiculous that we're doing our job and then coming home and doing the teacher's job.
DD1 has a great group of friends from her primary and has been incredibly happy there. But she wasn't particularly well educated there. Our giving up on the school and doing our own thing has meant she's far surpassed many of her peers, who were streets ahead of her in Y2 and although I'm proud of her for her perseverance and work ethic, I also feel very conflicted that other children (with less supportive (?pushy) parents) have stalled educationally. Many in DD1's class do not know all times tables to x10, can't divide at all, and struggle with concepts like fractions, angles or mean/ median/ mode. Most struggle to read books like Diary of a Wimpy Kid or Jaqueline Wilson. Children's classics (Charlotte's Web, The Hobbit, etc..) are not read in this school. Harry Potter is considered too ambitious for most Y6 pupils.
So in short, although I'm certain DD1 will miss many friends (this area has free grammar schools and dire senior schools - so pupils usually scatter to the four winds) - I personally am deeply relieved DD2 has changed schools and our time at St. Mediocre is coming to an end at last.
My hope is senior school will be about learning. No subject will be out of bounds (be it the solar system or dinosaurs - both not taught at this CofE school). And academic achievement - attempting to excel at a subject won't be 'frowned upon' by teaching staff but encouraged and supported. I hope DD1 will find that teacher that see's she's interested and suggests a great book, a good blog or website, etc... to learn more.
In short, I hope senior school will be an improvement on the dreadful mediocrity of primary school.