Is it better to get prep books for individual sections or as a whole?

So a little backstory. Technically PSAT scores have not been released but through naviance, I was able to see my scores early. I am in 10th grade and I got a 1350 - 630 R&W and 720 M. I really want to get that thicc national merit finalist.

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Anyway, I was wondering is it better to get books to help overall on the test or rather to get books in order to drill the sections you struggle with.

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Furthermore, I have been getting mixed answers when it comes to math. If I want to get a 760 on the math portion of the PSAT is it better to get PWN the SAT or the College Panda for math. But for Reading and Writing, I am instantly directed to the Erika Meltzer books... are they really that good?

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Thanks bois :)