This guide will show you how to level up your weapons and magic skills faster by explaining how it actually works.
"Secret of Mana" you will learn a fascinating story about a guy Randy, about whose bravery legends are made. Having discovered the Sword of Mana - an instrument of the greatest power, the young man learns that a powerful force of mana flows in his veins, which he knows how to subdue. Randy has to go on a journey, the purpose of which is to defeat evil forces seeking to master the power of mana. The main character will not be alone on his journey: he will be accompanied by the noblewoman Primm, a caring and purposeful girl, as well as the spirit of Popoi, distinguished by a mischievous but kind disposition.
Increasing the level of weapon proficiency
The only thing you really need to know is that you don't gain weapon experience by hitting an enemy with your weapon. You only gain experience after a killing blow. This explains the reason why one of your characters might be lagging behind in developing weapons, they just don't land the final blow on many monsters.
Better to just let everyone have the weapons they need, level up and control the person behind them until all three are aligned on each weapon. If someone is lagging behind, simply adjust the AI of the other two to retreat and attack exclusively with one lag.
Increasing the level of magic skills
It may be taken for granted, but the Water Temple is the best place to level up your magic. The main reason is that you can replenish your magic for free (not to mention save the game). He also has quick access to monsters that can be misused with magic. You will reach the monsters by exiting the temple and following the water to the right to reach the water area that leads to Undine. (First place where you got magic)
When you increase the level of Primms magic, you do not need to leave the Temple at all, just stand next to Luke. (she's the one who replenishes your magic for free) The trick to leveling up quickly is to know exactly when you can use it again. When casting a spell, do not wait for it to complete before casting it again. Watch Primm and she will move her arms and an Undine will appear (for example), once the Undine disappears and Prim takes her dormant position, you can use it again, even when the spell is still being cast on another character. Do not use magic on yourself, this will slow her down, as she will have to wait for the spell to complete before she can use it again. Just alternate between the other two characters. When you run out of mana, just talk to Luca, rinse and repeat until your levels are at their maximum.
As you level up Popoya's magic, you usually need to make your way to a nearby water area to level up his magic, since almost all of his magic is directed at enemies. Follow the same example as Prim for a quick application. Watch Pooi as he moves his arms and Ondine appears, once Ondine disappears and Popoi takes a dormant stance again, you can cast the spell again, even when the spell is affecting your enemies. You can also cast the same (or a different) spell on an enemy that is currently affected by your previous spell. As soon as you run out of mana, return to Luka and replenish your supplies. If you have a spell to cast on one of your characters, follow the Primms method, as it's much faster since you don't have to run back and fourth.
Conclusion
If you apply this guide correctly, you will double your magical leveling speed, even if you have already used the Temple of Water as a basis for leveling. Weapon leveling will also be less frustrating since you know how it works. Let me know if I missed something or if this guide confuses you.