Hello, i need help because my manager schedule me...

The employer must pay an additional fee to the worker for the additional hours of work,
the worker can file a complaint with the Ministry of Labor and the Human Rights Department of the Ministry of Interior
Here is the text of the Qatari Labor Law related to your inquiry:
Article (73)
The maximum ordinary working hours shall be eighty four hours per week at the rate of eight hours per day with the exception of the month of Ramadan when the maximum working hours shall be thirty six hours per month at the rate of six hours per day.
The time spent by the worker in transportation to and from the place of work and residence of the worker shall not form part of the working hours.
The working hours shall include an interval or more for prayer, rest and taking of meals which interval or intervals shall not be less than one hour and shall not be more than three hours. The said intervals shall not be taken into consideration in calculating the working hours in fixing the rest interval but the worker shall not work for more than five consecutive hours.
The Minister shall by a decision specify the types of work in respect of which the work may continue without stoppage for the purpose of rest.
Article (74)
The workers may be required to work additional hours to the working hours specified in the preceding article provided that the actual working hours per day shall not exceed ten hours unless the work is necessary for the prevention of gross loss or dangerous accident or for the repair or alleviation of the consequences of the said loss or accident.
The employer shall pay to the worker for the additional working hours the rate of not less than the basic wage plus not less than 25% thereof.
The workers who work between 9 pm and 3 am shall be paid the basic wage plus not less than 50% thereof with the exception of the shift workers.
Article (75)
The worker shall be allowed of a weekly paid rest which shall not be less than twenty-four consecutive hours and Friday shall be the weekly rest day for all workers with the exception of the shift workers. If the circumstances of the work necessitate the employment of the worker during the rest day the worker shall be compensated for the rest day by another day, and shall be paid for working that day the wage payable to him for the ordinary weekly rest day or his basic wage plus an increase of not less than 150%.