Hi,
Not a parent here, but accidentally wandered onto this forum, so my apologies if this advice is unwarranted.
I graduated HS in 2021, and your situation sounds all too familiar to a conversation my parents and I had the summer before my junior year, too. I went kind of crazy with the summer community college classes, to the point where I graduated HS with my AA degree, too lol. But by the time I was a senior and going through college application season, I was so relieved I wasn’t taking as many classes as most of my peers since I was ahead with credits. Whether or not it gives an advantage in college admissions… I have no clue, but it did let me have more time on my plate to actually dedicate to the applications without stressing out too much.
The summer before junior year, my mom was pushing for me to study for the SAT as well. The agreement we made was that I could take x amount of classes at a community college, so long as I also studied for x hours every week. I was able to manage the classes and SAT prep well, and got a fairly strong sat score 1500+ (even though colleges went test optional later on).
From a student’s perspective, ask your son why he really wants to take calculus over summer and is so determined on it. And depending on the time commitment for the class, perhaps have him agree to spend a certain amount of time for SAT prep in exchange for allowing him to take the class. Either way, pushing strongly for a certain outcome is probably going to frustrate him, and I always appreciated when my parents made efforts to compromise on a decision we both saw as beneficial.
I think the summer is also a great time to work on a meaningful EC since those can even have more weight than just stats (grades, test scores, etc). But, lessening his workload at school during the academic year also leaves more time to study and do ECs in the fall.
What’s the norm for his peers? I went to a very competitive public HS in Los Angeles county, CA, and it was kind of the status quo with peers who had similar grades to overload with community college classes. So that might also be a factor in why your son is pushing for that type of thing.
Either way, good luck to you and your family. As a student who burned out majorly in HS during quarantine, considerate parents like you are so valuable and I’m sure your son appreciates your concern!