For other topics, the study guide suggests practice questions to reinforce what you learned that day. This learning strategy is difficult to apply to Sentence Correction questions. The reason for this is that almost all Sentence Correction questions test more than one concept. In fact, in most cases, they test a wide range of concepts.

So, for example, the given sentence may have an error with subject-verb agreement, and among the answer choices, one may have a verb tense error another a parallelism error, another a dangling modifier error, and so on.

Given the variety of different grammatical concepts that can be addressed in one question, it makes little sense to tackle practice questions until you've learned all of the required content.

For this reason, you won't begin tackling Official Guide questions until after you've completed all of the SC content.

Cheers,
Brent

Hi Shakas,

I'm glad to hear the GMAT Prep Now videos are working for you!
Yes, you're right about the narration. I created (and narrated) all of the videos in the course.

Cheers,
Brent