For those seeking to refresh their pre-calculus knowledge, several book recommendations emerged in the discussion. The Blitzer book is considered decent, while Swokowski and Cole's book received positive feedback. For a more rigorous, proof-based approach, Shilov's "Elementary Real and Complex Analysis" is suggested, particularly for its first six chapters that cover pre-calculus topics in depth. Alternatively, for a more applied perspective, standard high school pre-calculus texts are deemed adequate for review.