Child needs motivation to study. The motivation starts from you as a parent. First step to it is, sit along with your child when the child studies. Your presence beside them while studying increases their interest. However, avoid using your mobile or laptop, instead you can read a book or work on your interest.
Involve in casual discussion about study beyond the usual hours. Make it more fun. Use play time, food time, during a drive, bed time etc. It must not be fault-finding but a healthy and fun-filled discussion. You can think creative ways to do it.
For instance, choose a subject each day and discuss about what was taught in the subject lately. It will make the child to concentrate more on the subjects. Show interest in knowing about child’s favourite subject, class and teacher too