Generally grinding levels in World of Warcraft Classic is hard work which can take days or weeks to achieve your goal. Excepting for finding a professional booster to help you, here are some useful tips and guide to help you level up fast.

 
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The race you choose will make a big impact on those maddening crowds. Half the Horde will be queuing with you in the Valley of Trials if you choose Orc or Troll to kill the same boar. On the Alliance side, pick Human and watch as player after player taps that wolf just before your spell hits. If you want to make it to 60 as quickly as possible, go for a less common race, such as Gnomes or Undead. They’ll still be popular—each faction only has four races to choose from, after all—but it won’t be as awful.
 
Inns and Citiesare points of relaxation. Safe spaces away from ravenous wolves and mouthy Murlocs. These won’t be too much use to anyone doing a marathon run to the end, but for anyone taking it easy and looking to get the most experience points for their time, logging out at an inn or city will allow you to accumulate “Rested exp” while you’re away. Rested EXP doubles monster kill EXP totaling the amount accumulated over time, meaning you’ll get a nice little bonus upon your return.
 
It's a matter of choice whether you want to pick up professions while you're leveling or wait until later on.Stopping to pick herbs or craft items or gear will obviously take away from the time that could be spent killing enemies and gaining experience. But if you choose a profession that turns over a profit on the auction house, you'll stand a much better chance of affording that mount and Riding Skill when you hit level 40 which will, in turn, speed up the last 20 levels.
 
EARN WOW Classic GOLD IN WOW CLASSIC QUICKLY- this is related to another point that we'll lump in here - gathering and crafting professions are a player's friend. Skilling those up, selling excess materials, and providing relevant gear to make leveling faster are all desirable traits, and it's all tied to professions. Killing every enemy will also help generate gold quicker through vendoring trash and any rare items that might drop. Gold is the bottleneck on some later game content - whether it be gear, repeated travel, or getting a mount, which speeds things up drastically - so focusing on using it wisely and generating it as quickly as possible is a good idea.
 
Except for these mentioned tips, addons can increase your leveling speed, and leveling by questing in WoW Classic can also make your leveling fast.