If DS will be moving placement in September, the EHCP needs to be finalised at least 5 months in advance, so the phase transfer review meeting should have been held by now.
The EHCP can remain in force until 25, or 26 if necessary (although doesn’t cover university) and provision not typically available to other students can be available for EHCP students.
Do you think a mainstream independent tutorial college would work?
Would online schooling work for DS? Alongside other provision for his ASD/ADHD. If online wouldn’t work, what about in person tuition?
Wemms is a special school has a mixed reputation. Parents either love it or hate it, but it offers some A levels and sometimes allows DC to attend until 20. That may be within travelling distance of where you are.
It is a SEMH provision, but not your typical SEMH provision, so depending on DS’s needs, you could look at West Heath. They offer A levels in conjunction with colleges. Most of their DC attend their sixth form before Y14, but they may still offer a place until 20.
Be aware if you move LAs, the new LA will review the LA and potentially amend, reassess or propose to cease to maintain. You will be able to appeal, but it is something you need to be aware of, especially post 16.