Is it permissible for an employee contracted with a governmental entity, who declared himself unemployed to obtain academic admission and a university stipend, to take this stipend, knowing that he is in need of it?

The scholarship-granting body's condition may mean that the student should not be employed, whether by formal or informal contract, so as to avoid combining a salary with the scholarship. If that is the case, then you are not permitted to take the scholarship unless you have permission from the authority responsible for your employment; otherwise, you must return it. There is no consideration for the actions of some students who combine informal work with the scholarship; the corruption of people does not permit participating with them. However, if the body means by 'employment' stable, formal employment and does not mind temporary work, then there is no harm upon you. The entity that determines the intended type of work is the scholarship-granting body, so it is necessary to inquire from them.