Year 7 class groups allocation

I wouldn't worry. The primary school friendships drift apart alarmingly quickly anyway. DD had the same best friends throughout primary and was put into a different y7 class to them. Within about a fortnight they all had new separate friends to each other!

There were 7 kids from DS2's school who went to his secondary (more in DS1 year) and 10 forms.
I warned him he could be in a class with noone he knew.
He was in a form group with one child he knew, but in actual classes with none of them.

It's a great way to meet new people.

DD3's school asked the children for names of children they got on with. There were 2 classes in DD3's primary and 11 classes in year 7, so it was inevitable that not all the kids would be together.

The students are split into 3 groups in year 7, and those groups will all be streamed together. So if you were in S, all your classes would be with children from S. Sets for maths, science, and PE. All other classes have exactly the same children.

At lunch and breaks, they find their friends. It seems they tend to split into friendship groups that are relatively large, but further friendship circles exist within the group.

We visit primary schools and get intel from them about which children would do better separated. Parents also often make requests at interview. Setting will also play a part. How the child is on induction day also can lead to some switches, as can how they handle the move to secondary during the first half term.

It’s something that may vary between schools.

The children my year 7 DS has lessons with are, for the most part, different to the children that are in his tutor group.

Just reread that, it made more sense when I wrote it. Sorry
Ask the school if your worried and I'm sure their put you at ease.

Normally the secondary school have a allocation person and they visit the primary or at least talk to them and go on their recommendations, they often ask if theirs any child they get on with or don't. None of my 4 children have ever been in tutor with their best friends, the classes themselves are normally mixed up. At my kids school their were 4 houses mine have always been in blue but the children all mix in lessons but it could be a blue and yellow class or blue and red would never be blue, green and red children in class. Ability doesn't matter till year 9 but still stay in whatever colour their in. In year 10 (GCSE) they still stay in blue but could be all four colours for a subject

I’m not sure but my daughter was separated from her three other friends from year 6, they were also the only four going from their primary school and wasn’t a problem because when the put them in skill sets they might be the same as friends and have lessons together anyway.