Question

Trial copies of pages printed for approval before final
copies are printed are called​

Answer 1

Answer:

Galley proof.

Explanation:

Historically, some publishers have used paper galley proofs as advance copies or advance reading copies (ARCs) or as pre-publication publicity proofs. These are provided to reviewers, magazines, and libraries in advance of final publication.

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Answer 2

An uncorrected proof

An uncorrected proof is a proof version (on paper or in digital form) which is yet to receive final author and publisher approval. The term may also appear on the covers of advance reading copies; see below.