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" He drove his car specially through th streets" Which is the preposition here?
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Hello. shruti—and welcome to English Forums.

Your sentence has problems. 'specially' makes no sense in it. Please check the original carefully and re-post it.
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This was a sentence given to class 3 student and asked to circle the preposition. I felt 'through' is the preposition here. but her teacher has circled 'specially'. hence this doubt.
The sentence is faulty and 'specially' is an adverb. The preposition is indeed 'through'. It is time for you to find a new teacher, a new class, a new school.