How difficult is Aagaard's Grandmaster Preparation series? : r/chess

Grandmaster Preparation (Pergamon International Library of Science, Technology, Engineering & Social Studies)

Grandmaster Preparation - Positional Play

Grandmaster Preparation by Lyev Polugayevsky, Paperback | Pangobooks

Aagaard Jacob Grandmaster Preparation. Calculation - Caissa Chess Store

Grandmaster Opening Preparation (Paperback)

Grandmaster Preparation - Thinking Inside the Box by Jacob Aagaard (twarda okładka)

How would you rank these series from easiest to most difficult? : r/chess

Chess Books Ph - Grandmaster Preparation Series by Jacob

Chess Book Grandmaster Preparation Attack and Defence by Jacob Aagaard

Grandmaster Preparation: Part 2 vs IM Marc Esserman