@thumper1 ok thanks that makes sense. I know he will need to write the SAT or the ACT and MIT also requires SAT subject tests in math and science.
From what I’ve gathered from reading posts here our science curriculum works a little differently. Grades 9 & 10 cover all the sciences then in grade 11 you have your choice of biology, chemistry, and physics as separate courses. The grade 11 course leads to the grade 12 course so if you don’t take the grade 11 credit you can’t take the grade 12 one. We don’t take one science in grade 11 and a different one in grade 12. We take them in both years. So DS will have grades 9 & 10 general biology but he is not planning on taking it further. He will be taking both physics and chemistry in both grades 11 & 12. The grade 12 credits will be AP Physics 1 and AP Chemistry.