FIDIC sometimes provides watermarked, non-printable previews on their website for educational purposes.
You can as well check your University library. yellow book fidic pdf
While you can find "Yellow Book FIDIC PDF" files online, FIDIC copyrights these documents. For official project use, you should purchase the official digital version from the FIDIC website to ensure you have the latest errata (corrections) and legal rights to use it. FIDIC sometimes provides watermarked