As an honors math teacher I would not recommend it unless you are exceptionally gifted in math.
You are preparing for calculus and a summer course will usually have to omit and rush through topics. To distinguish yourself from your peers (I understand that motivation) do something unique or independent.
I teach in a wealthy school district , the first year the system decided to double-jump students, so that they would take AP Calc as juniors, there were 75 kids in the double-jump sixth grade class. Six years later I wondered how many students made it to Advanced Calc: there were 6, out of 75. Although it is still done because of parental pressure, experience shows that it just doesn't work for most students. I have had C students who got into Harvard or Yale because they played the French horn or were fluent in a strange language.
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