Answering questions in practice is one thing -- you can drill SC, CR, RC and seem ok.
Answering questions when they are mixed up with other verbal questions -- 1 SC, then 1 CR, then 3 RC, then another CR, etc - can force you to adjust your mode of thought frequently. So you need to prepare for this during practice.
You can, for example, pick random questions in random order during practice. That way when the real test comes, you can be better prepared.
Since the test is in front of a computer, make sure you are comfortable doing questions in front of a computer. Don't be studying with a book and then be surprised that answering questions in front of a computer screen feels weird. To better prepare for this, we recommend doing questions on the Practice Pill Platform
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What's Inside GMAT Pill?
Zeke Lee, GMAT Pill Study Method (Study Less. Score More.)
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