Need to find every instance of "Complex sentences" or "Task 1 map vocabulary"? Ctrl+F (Command+F) in a PDF finds it instantly. Try doing that with a paper book.

The term "repack" often refers to a digitally optimized version of the physical Superpack. This version is popular among students because:

Included in some versions (like the Premium or 4-book sets), this component offers expert techniques for answering complex question types like flowcharts, maps, and graphs. Why Choose Barron's for Your IELTS Prep? IELTS Superpack (Barron's Test Prep) - Amazon.com