Our school lasts until the 3rd week in June. So I'm signing DS up for the June tests dates. The SAT Subject test will be 2 weeks before finals. I don't see a conflict in studying for these tests and studying for his semester finals. They should cover a lot of the same material.
DS's school is moving up our schedule by one more week this summer (starting in August for the first time) and so next year there will be less time between these tests and finals. But more importantly one week less AFTER AP exams. My DS won't be taking any AP's this year so he wouldn't have had conflict with the May date but I wanted him to have as much of the class as possible before the tests.
Thanks for the feedback. Having him try a sample test this weekend and see how he does before enrolling him.
