The "Audio Free" edition can often be found for pennies (or free in library discard piles). For a student who needs only grammar and reading practice and has zero budget, this is a viable option.
The reading passages are long (typical for PBT) and the vocabulary is dense—often more difficult than the current iBT. If you can handle the archaic topics (e.g., "The geology of the Rocky Mountains circa 1985") and the long paragraphs, you will find the iBT reading section easier by comparison. The strategies for finding main ideas, scanning for details, and inferring meaning are timeless. The Heinemann Elt Toefl Preparation Course Audio Free
The modern TOEFL iBT is defined by integration : Read-Listen-Speak (Task 3 & 4) or Read-Listen-Write (Integrated Writing). This book treats each skill in isolation. You will never practice the critical skill of taking notes while listening to a lecture, then summarizing it in writing. This is the single biggest reason not to use this book as your primary source. The "Audio Free" edition can often be found
Treat it as a workbook for grammar only. Combine it with free online resources (YouTube: "TOEFL iBT Listening Practice," ETS’s free mini-tests, or the "TOEFL Go!" app). Do not, under any circumstances, rely on it to teach you the modern exam format. If you can handle the archaic topics (e