What is the ruling on using free time for studying during work hours due to tasks being withdrawn from the employee, and is the earned salary lawful or unlawful in this case? Also, what is the best course of action to take with an employer who intentionally harms an employee psychologically and physically?

It is not permissible for an employee to utilize official working hours for anything other than the agreed-upon work, unless with the employer's permission, for the Prophet, peace and blessings be upon him, said: "Muslims are bound by their conditions." The employer owns this time by virtue of the contract. Therefore, it is not permissible to use free time for studying unless with the employer's permission if it affects the work; otherwise, there is no harm.