The best way to teach is to praise praise praise everything the student is doing right, gently correct what they aren't, praise their attempts at correcting the problems you so gently pointed out, and deep-six the criticism which works on no one and nothing. Also, make sure the student understands what you want from them. Demonstrate. Have them repeat the demonstration. Speak kindly. Care about your student and their progress. If this isn't what you're getting, it's time to "deep-six" your instructor. You don't need to pay for poor teaching. You can usually find that for free.