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My first quarter of school included classes such as Biology, Chemistry, and Algebra, all of which I received an A in.

I am confused because i thought you shouldn't end a sentence with a preposition. This is for a very formal letter so proper grammar is very important.

If not, how can i rework this sentence?

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It is not always wrong to end a clause with a preposition, but, in some cases, it is considered incorrect. Here are cases of correct placement at the end.

  • John was left with no one to talk to.

  • (ref.: CGEL) I bought a car for Mary to drive to work in.

  • (ref.) And if Job did feel this, what did he imagine God was punishing him for?

However, in your sentence the preposition can't be placed at the end; this is felt to be an awkward construction. They are several ways to make that right; here are two.

  • My first quarter of school included classes such as Biology, Chemistry, and Algebra, in all of which I received an A.

  • My first quarter of school included classes such as Biology, Chemistry, and Algebra; in all of those, I received an A.

LPH
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  • thank you so much! just a general question, what do you mean by "awkward construction?" is this a grammatical error or is this a subjective thing? – user130306 Dec 23 '20 at 07:27
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    @user130306 It's subjective, it results from my reader's experience; I never would choose that possibility, it just feels awkward to me. – LPH Dec 23 '20 at 07:29