Is falling short in one's studies or being absent from lectures while receiving an allowance for it considered earning haram money, and is expiation required for that?

Neglecting studies without a valid excuse is reprehensible both religiously and customarily. If it leads to failure, waste of time and money, and causes sorrow to parents, it may reach the level of sin due to the harm inflicted upon parents and the squandering of a trust. Indeed, a person is a guardian and responsible for his charge, and this includes safeguarding and preserving the father's money. The student's allowance, conditioned upon attending college, is a trust that must be preserved for this purpose, or returned, or permission sought from the father. Otherwise, it would be considered a breach of trust and consumption of money unlawfully.