Have you assessed their reading and maths levels? Do you know all that is being done? Mine sometimes play games during the day. My 10yo loves to play video games - he's been playing one recently about the development of rain forests. He also does games on his online typing lessons. My 7yo plays reading and maths games. Someone could possibly see us out and about during the day and think they're not learning, I suppose. They'd be wrong, but they could think that.
The moment I withdrew my child from school halfway through year 1, there were comments of "what about socialisation?" "how will he learn to read?" "how will he be educated?"
He'd already been in full time school for nursery, reception and half of year 1. He couldn't read, add, count reliably to 10, had absolutely no friends. He was autistic and dyslexic, however, the school refused to differentiate his work and refused to provide the needed support. They were demanding that a child with recognised memory problems and probably dyslexia (as highlighted by assessment done by the senco) and that couldn't reliably count to 10 memorise the number bonds to 20 (just as one example of the difficulties). The teacher's words "he doesn't have to understand them - just memorise them!" Pointing out that he had an actual problem with his short term and working memory yielded nothing in response. He was having daily meltdowns as he couldn't cope. He wasn't getting extra help. He was just left to flounder and then fell apart daily. He was at risk of exclusion and was being put in an isolation room when he had meltdowns. A 5yo - put on his own into a small room and left there. He was terrified and it only made his anxiety worse. When I found out about the isolation room, I withdrew him from school to home educate.
He is now reading, adding, subtracting, multiplying, has friends, attends activities/clubs. His anxiety is greatly reduced as he is no longer being bullied daily as he was in school (which the school refused to acknowledge and refused to do anything about).
My oldest thrived on school and did well there. My younger two struggled, so we now home educate. It has been the best option for them. They have both progressed very well and have more friends and activities now than they ever had at school.