To be straight up, my DD doesn’t go to Weald in Sevenoaks (she’s at at girls school in Tonbridge & currently Year 7) but her two best friends from Primary do and we’re outer Sevenoaks so I hope this will be vaguely useful! I’ve also a friend in East Sussex who’s DD is Year 7 at Weald Sevenoaks.
As you probably know, the annexe is on the same site as Trinity, a newly built Christian school. There are very regular trains from Orpington to Sevenoaks (about every 10 minutes from a quick look I’ve just taken). From there she would need to get the bus. Kids come from all over into Sevenoaks and while buses out to Weald are frequent (the stop is named as Trinity, not Weald FYI), kids for Knole and Trinity also use the same buses so they are rammed! It’s about 10/15 minutes from the station to the school on the bus.
Weald is locally here the most popular Grammar choice for girls. Having said that, half of the parents through preference choose the Tonbridge site (maybe as it’s bigger?). You are allowed to give a location preference - however you might not get that! DDs friends parents chose Sevenoaks, however my E Sussex friend chose Tonbridge but was given Sevenoaks. That does work in your favour as Sevenoaks seems to have lower demand than Tonbridge - however, that could of course change!
Both DDs friends have settled in well in Year 7 and have been given quite a lot of work on lockdown. Of the 3 kids I know in Year 7 in Sevenoaks Weald, they are all really decent, bright (if not super super bright, they tend to go to Tonbridge Girls Grammar) girls. From what I know, Weald Sevenoaks Girls come from all over, from Orpington down to Bexhill. That unfortunately though is part and parcel of our better schools in this part of Kent. DDs classmates come from a wide
area too and it really is something to take into consideration. We were thrown into DD having/giving sleepovers earlier into fledgling friendships than we would usually have wanted. If your DD has good local friends from Primary & keeps up with them that does make the difference though!
If my DH hadn’t been grammar opposed, Weald Sevenoaks would have been my choice. Everything that I can see hasn’t changed my opinion on that!