If you have all parts but part 3 is corrupted, the entire extraction will fail. If this is the case, you would need to redownload this specific part.
You cannot "review" part 3 on its own. Extraction software (like WinRAR or 7-Zip) requires all volumes to reconstruct the original file. EvAV1.part3.rar
Large applications or games are often split into smaller .rar segments for easier uploading and downloading. If you have all parts but part 3
Multi-part RAR files are common for high-definition movies or TV show episodes shared on file-hosting sites. EvAV1.part3.rar