Also, encourage your child to quiz you about test material. Give wrong answers on purpose, so your child will explain concepts. Make sure your child gets enough sleep and eats well. Good nutrition and sufficient rest do have an effect on your child's mental performance. Encourage your child to eat a healthy breakfast.
Breakfast gives the body brain energy to start the day and to do well in classes.
Set reasonable expectations. Sit down with your child and help him or her decide on challenging but realistic academic goals. Also, decide on reasonable standards for homework together. Offer incentives for good grades. But don't overdo it.