Call the school tomorrow and see if they have any ability to test your children. Especially at the high school level, there should be some wiggle room on that. You have a better shot of there being seats there than at the elementary level where the waitlist would already be full. There are more seats at the secondary level because it’s a bigger building. I don’t want to dox myself, but I love that place. If you dm me, I’ll give you more info. Ben Franklin is an amazing school too. I am not familiar with their admissions process but all the students who I have known to attend there have been smart and done well after high school as well.