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I think Lawrenceville has seen the negative effects of too much rigor and plans to adjust.
NO, I don't think schools need to be overly rigorous, with so many hours of homework resulting in reduction in needed sleep or free time to explore one's passions.
There are many brilliant kids on the BS campuses. They would be better off if they offered more free time to spend on developing passions...give the artist more time for their art, the inventors time to invent, the computer coders time to write apps, the athletes time to lift weights, etc.
I don't think all schools are this way; and I think the ones that are not are onto something.
In public school, kids are taking 6-16 AP classes (yes, 16 in states that allow them to start AP as freshmen). These kids do not need all those courses, and they cannot fully benefit from every course if they are overloaded. That's the "Race to Nowhere" and it's not about success based on unique strengths or passions, but rather based on competition. The colleges and the College Board need to reign this in.
What year are you? You could retake them next year, if time permits (ie, don't bother if you're a senior; and if you're a junior you may have others to prepare for, so a matter of priorities). I'd only worry about the Chem, and only if you are interested in STEM / science majors. You don't get credit at most highly selective schools anyway; you just place out of a class if you have a 4/5 (sometimes 3). But at competitive schools, you may not want to place out anyway. I know people that did that with Calc and Chem and then were getting D's in the next level...not a great way to start freshman year, esp in their cases as Pre-Med.