How can one prevent a wet dream, especially if it causes difficulty in performing ghusl in the morning before school or during school trips where no places for ghusl are available?

One must perform ghusl (ritual bath) after a wet dream if seminal fluid is seen, and it is not permissible to abandon it out of shyness, as this is blameworthy modesty. The Companions used to perform ghusl or tayammum (dry ablution) after a wet dream, and the Prophet, peace be upon him, affirmed this. The absence of a designated place for ghusl is not an excuse; one can perform ghusl anywhere that covers the 'awrah (private parts). There is no way to prevent wet dreams as it is a natural occurrence, but one should avoid thinking about women and sexual intercourse before sleeping and adhere to the remembrance of Allah before sleep, such as Ayatul Kursi (the Verse of the Throne), for wet dreams are from Satan.