Is it permissible for a female teacher to take sick leave to sit for master's exams if there is no other solution to avoid unlawful absence from work and the resulting deduction from salary?

It is not permissible to defraud the work system by taking sick leave without being ill in order to take exams, because Allah Almighty says: "O you who have believed, do not consume one another's wealth unjustly," and because the Prophet, peace and blessings be upon him, said: "Whoever cheats is not one of us."