I'm sure students will do a cost/benefit analysis to what exams to study for vs. the perceived difficulty. But a lot of students already take AP physics, AP cal

I'm sure students will do a cost/benefit analysis to what exams to study for vs. the perceived difficulty. But a lot of students already take AP physics, AP calculus, AP chemistry, etc. and submit those scores with their college application, which is factored into their admission. So I don't think there will be a mass exodus of students away from those subjects. You're right that some classes are just participation/presentation. But I still think subject tests are a lot closer to "real" high school/college/job than a general intelligence test.