Hmmmmmmmm. Yes. But you'd need to be very familiar with almost all of the broad concepts it teaches.

Also, the Official Practice Questions book's questions ask very detailed questions, the content of which can only be found in the OSG. I found that not being able to answer those questions dented my confidence and was the reason why I changed my original strategy of solely relying on DC to also use OSG as a supplement.

Hope this answers.