Level 56 WoW Classic quest. Gather Un'Goro Slime Samples from any of the slimes in Un'Goro Crater. Then, using the Testing Equipment next to Chemist Fuely in Undercity, see which of your samples are the most pure. Bring 5 of the Pure Un'Goro Samples you find to Chemist Fuely.
Level 52 WoW Classic quest. Find J.D. Collie in the cave at Marshal's Refuge.
Level 52 WoW Classic quest. Resurrect, then look for the gravestone that Gaeriyan told you to find.
Level 55 WoW Classic quest. Lead Ringo to Spraggle Frock at Marshal's Refuge.$B$BIf Ringo faints, use Spraggle's Canteen to revive him.
Level 52 WoW Classic quest. Take a Bloodpetal to Gregan Brewspewer in Feralas.
Level 52 WoW Classic quest. Use the Scraping Vial to collect a Hive Wall Sample from one of the Gorishi hive hatcheries in Un'Goro Crater. Look for the chambers with the hanging larval spawns.$B$BBring the Hive Wall Sample to Hol'anyee Marshal in Un'Goro Crater.