Do the theme dungeon quests. They are designed to give good experience for your level. For example, the Ellinel Fairy Academy dungeon has quests that can quickly boost your level.
You can level up fast by completing all the assigned tasks and challenges. Also, interacting frequently with other characters and joining clubs can help.
One of the dimensions of the fast-moving novel was the web novel. It referred to the stories and plots of the protagonist in different time and space backgrounds that were circulated on the internet. These works usually depicted a colorful world based on the protagonist's experiences and encounters, accompanied by various fantasy plots and characters. The fast-moving literary plane was usually closely related to online literature as a form of expression.
Complete missions with a high difficulty level. These often give more XP. You can team up with friends who are also good at the game to increase your chances of success. For example, some heist missions in online mode are not only challenging but also rewarding in terms of XP when completed successfully.
I'm not aware of any legitimate cheats to level up fast in High School Story. The game is designed to be played over time, and leveling up should be based on your in - game achievements and progress. Just keep playing, participate in events, and complete tasks.
Do a lot of missions. The story missions usually give a good amount of XP. Also, participate in races. Even if you don't win, you still get some XP for taking part.