How can I tell if I am being a good mother?

Sometimes i do wonder i did not do my best as a mum. Like getting my child to do some acad work is difficult and I do wonder is it he's bored of me or what as he dont really listen to my instructions. Then one day I told him his mum is a bad mum and he said "No! My mummy is a good mummy!" I guess kids just love us unconditionally regardless how bad we think of ourselves.