How to end a sentence (if at all) with a preposition?

Question

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?

LPH · Answer

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.

How to end a sentence (if at all) with a preposition?

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