1. Calibrate your sound levels
Using headphones, listen to the calibration audio file. Then, without your headphones on, rub your hands together closely in front of your nose, quickly and firmly, and try producing the same sound.
If you have trouble hearing the sound of your hands rubbing, the test is already completed: you likely suffer from a severe hearing loss!
Adjust your computer's volume so that both sound the same: the calibration file through your headphones or your ear buds, and your hand rubbing, without your headphones or ear buds. Once matched, do not change your levels anymore during the rest of the test.