There is really no better way to practice SC principles than to do OG problems. Strategy guides will give you the skills and content that you need to know, but in order to perfect those skills, you have to practice on the real GMAT questions!

The most helpful way to build those skills is to study topic by topic. For example, read what the various guides have to say on pronouns, then practice a dozen or so OG pronoun problems in a row. This will help you to develop an instinct for the ways the the GMAT tests these rules, and how to recognize them. The goal is to build pattern recognition. Good luck!