Manhattan SC 2003 eddition vs 4th edition

The content included in the Fourth Edition Strategy Guides is very similar to the Third Edition with the key differences being the following:
1. The Third Edition Guides are built around the 11th Edition Official Guide, while the Fourth Edition Guides are built around the 12th Edition Official Guide. This has required us to revise the problem sets at the end of each Manhattan GMAT Strategy Guide so the question numbers correspond to the appropriate problems in the new Official Guide.

Note that much of the 12th Edition is completely unchanged from the 11th Edition. Only 1/3 of the questions (approximately 300 problems) in the 12th Edition are new, but many have been reordered / renumbered. View Manhattan GMAT's in-depth examination of the 12th Edition here: https://www.manhattangmat.com/official-guide-12.cfm.

2. Additionally, in the Fourth Edition Manhattan GMAT Strategy Guides, the Advanced Content has been moved to the back of the books. We believe it is more appropriate for students to begin by learning the basics and then progress to the more advanced content when ready. It can be daunting to see some of the more complex content early on in your studies.

Thanks everyone for their inputs.