The best, risk-free approach is to leverage official channels like the ones listed above. To recap, here are your best options:
The third edition refines the explanations, updates the problem sets, and ensures that the mathematical rigor matches the needs of modern university curricula. Benson’s clear writing style breaks down complex physical phenomena into digestible concepts without oversimplifying the underlying mathematics. Core Pedagogical Features of the 3rd Edition
What specific (e.g., mechanics, electromagnetism) are you currently studying?