The World Health Organization (WHO) doesn't maintain a list of approved medical schools. WHO's role is primarily focused on setting global health standards and collaborating with countries on healthcare issues. Recognition of medical degrees is usually handled at the national level by individual countries' licensing boards or ministries of health.
Therefore, whether Tbilisi State Medical University (TSMU) – or any other medical school – is "recognized by WHO" is not the correct question. The question is whether its degree is recognized by the licensing authority in the country where you intend to practice medicine. You need to check the specific requirements of that country.