As others have said, you need to compare like with like.
In Italy, they need to have started before they are 7 and after they are 5, but all children, bar very few exceptions will have done 3 full yrs of maternal school, not compulsory, but everybody does it, because a) it's free and b) children are taught to read and write there, not at school.this is why parents try to get their kids to start as late as possible so they have as much literacy and numeracy prep under their belts as possible. Dd, at one mth short of 6 when she started is the second youngest in her class.
As soon as they start, there will be compulsory homework. Usually 2 -3 hrs daily. There is no play as such. They might get the glittery shit out Christmas week, but it depends on the teacher.
They do 2 lots of Sats style tests. At 7 and 10.
If you take what children do, all around Europe, at AGES rather than school years, you'll see there is actually not that much difference. A child may do long division in the UK in yr 3, a child in Italy might do it in Yr 2, but their ages, broadly speaking, will be the same. ( that was an example, I can't remember when Dd did it)