@rosegeo - My son is OOS in Aerospace Engineering. He got the NMF package. He is now a junior. He took his calculus and chemistry AP science credits and other APs for 48 credits total. So for engineering and math, freshman year he took honors Math 253 and 308, Physics 218 and 208, and honors Engineering 111 and 112. He got As in all those classes except for Engineering 112, where he got a B. Total credits taken were 31. He finished with about a 3.84 after freshman year and still carries around a 3.75 with two minors (history and German). He could have taken it easier without the minors.
So it can be done. I will say that my worked harder than he ever did in one of the top high schools in the US, even with 15 AP exams passed. Your son can do it, but he needs to be willing to focus and work hard.
@AGmomx2 gives very good advice.
One other thing, a 3.5 is not required for all scholarships. My son is required to maintain a 3.5 GPA for his President’s scholarship and his National Merit scholarship. For the OOS tuition waiver, he needs to keep a 2.75 GPA each semester.
Feel free to send me a message if you have any more specific questions.