I don't know whether to repair cars or work in coal mines.

Look at the present situation of your family, you need money badly to go to the coal mine. For example, it is better to be a logistics worker or an electrician, a repairman or a machine operator. You don't have to wait for money to repair a car, but you should study hard, study hard, work hard and use your brain well. In a few years, you can repair all kinds of cars by yourself. Apprentices earn very little. You must be determined and patient. Above all, you should not learn to repair cars.