If you're looking for the 2010 edition (often co-authored with V.M. Deputat and others), several platforms offer free access:

Apply the "70/30 rule"—spend 70% of your study time active (solving problems) and only 30% passive (reading the text).

Breakdown of complex calculations for elements like Oxygen and Sulfur.

A way to check your work after attempting independent study, which is a core part of the 10th-grade curriculum.