Is it permissible to delay the Asr prayer due to studying in high school, when there is no other option?

Part of a Muslim's repentance is to observe prayer at its legally prescribed time. It is not permissible to intentionally delay the Asr prayer until after sunset, and it must be performed on time, even if at school. Intentionally delaying a prescribed prayer without a valid excuse until its time expires is considered a major sin. Allah has warned those who abandon prayer and are negligent concerning it. The hadiths of the Prophet, peace be upon him, have cautioned against intentionally abandoning prayer, for the Prophet Muhammad, peace be upon him, said: "Do not intentionally abandon a prescribed prayer, for whoever intentionally abandons it, then the protection of Allah is disavowed from him." Wasting prayer means letting its time expire, not abandoning it entirely.