Not only pairs with but also. Keep the two halves in the same grammatical shape. Not only the score but also the timing. Parallel lists as a set are in parallel structure.
Match the second half to the first
After not only, notice what kind of word you used: a noun, a verb, a prepositional phrase. After but also, use the same kind. Not only studying but also to sleep is the usual miss. Either/or is a neighbor, in either or.
Neither/nor is in neither nor. Idioms as a set are in ACT idioms.
The bottom line
Not only with but also. Same form on both sides.
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