Grnflash, I don't know specifically about the schools you mentioned but I'd like to invite you to come to a GATE District Advisory Committee meeting. The next one is on Oct. 13th. It's a great place to meet other parents with GATE children and also talk to district personnel. If you go to the district website under the GATE department you can find the information about the committee. It's a parent group and anyone is welcome to come.
I have heard that there are some schools that fill in their Seminar classes with Cluster kids too soon and then say they are full. They are not supposed to do that.
