When can a school leaver claim benefits?

[FromDespairToHere]

DD is 19 and has just taken her A levels (she did an extra year at sixth form college). She's not going to uni but has signed with a couple of agencies looking for work. Atm I'm still getting TC and CB until the end of August.

Does anyone know when she can claim benefits if she doesn't find a job? Obviously I'm aware that if she finds work or claims benefits then mine will stop.

[goose1964]

Once the new school year starts. It used to be when schools broke up so we all signed on for the summer holidays.