The "5 lb. Book of GRE Practice Problems" by Manhattan Prep is a study guide aimed at helping students prepare for the Graduate Record Examination (GRE). It is the 3rd edition of the book and contains over 1,800 practice problems both in the book itself and online. The book is part of the Manhattan Prep 5 lb Series, known for providing comprehensive study materials for standardized tests like the GRE. The book is in paperback format and is authored by Manhattan Prep, published under Manhattan Prep Publishing, making it a trusted resource for GRE test preparation.