If you are choosing one of the linux courses that includes the cost of the exam, then you need to know how much it costs separately. Currently the RHCSA exam will cost you around $400, which doesn’t include any sort of training. You should think about when you are going to take the exam so that you can create a training schedule.
The training will be a separate cost, so consider that when you are creating your budget. The test is important, so if you want to take it right after the class, then find one that includes the cost of the test as well.