Please recommend the most supportive prep in London (SW, West or Central)

[WalkingDead99]

My summer born DS is finishing reception in the bottom of his class. No diagnosis or obvious learning difficulties. He is bright but not mature enough emotionally. I know I should have kept him to start Reception after he turned 5 but it is too late now. He is behind in reading and writing. The current school's report says that he is at expected level in math but when I took him for assessment to another school I was told he is behind even in math. Looks like the current school's curriculum is behind other preps' curriculum. He loves math so I was really shocked.
His current school teachers said they tried interventions but could not bring him up to expected level and they do not have time to provide help.
I know my DS is capable to catch up. When I teach him he makes noticeable progress. I am not a professional teacher but I wonder if I am better than the school teachers. The issue is I cannot drop my job and homeschool him.
I would like to move him to a prep that would provide extra support to help him to catch up and stay on track.
I would appreciate if someone could recommend such prep in London (SW, West or Central) that will not require to pay double school fees for extra support.

If anyone does care about the vat issue, read more about it and sign here :

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Hi, a lot of this response seems to join the school in gaslighting you. You know if your son is not flourishing, and sounds like school don’t want to help him. Schools can do better than this.

My son is at a state school. Summer born reception. School is top 100 in England for results last year.

4 mornings a week there are 25min booster sessions in small groups for phonics, numbers, writing. These are free. Most children have been to at least one. My son can read picture books fluently, do times tables up to 12, and write short descriptive sentences. My son has autism so has some additional needs although he is also very bright, we do not have a tutor.

Accepting children falling behind is not providing the right education for them. You are right not to accept it and to support your son - if you live near a state school with a good reputation I would also speak to them. I was privately educated and will be paying for secondary school but honestly cannot fault our state school except for lack of sport and music which we do outside of school.

That's utter rubbish. Most private schools are charities.
SEN provision being rubbish in state schools is the reason labour are exempting those with EHCP from the 20% VAT increase.

Not in my experience (one kid in state & one in private)

A school like Dulwich college is going to have a waiting list a mile long, with parents who have been prepping kids since 3.

I would be very surprised if they were to accept an already underperforming child.

At 5, you can teach him yourself. An hour a day of maths over the summer holidays. He can catch up.

Dulwich College only takes students from Year 3 (age 7) - do you mean Dulwich Prep OP?