Hello, thank you for taking the time to post your question!
There are a lot of strategies that you can use in order to help your child study more effectively at home. I think the two most important ones are to set up a Conducive Study Environment that is organized, quiet, well-lit, and free from distractions and to establish a Consistent Routine with a regular study time and the ability to take breaks to recharge as needed.
Beyond that then I would try to communicate with teachers to see what is or is not working and then celebrate progress that they are making toward their goals!
Hopefully that gets you moving in the right direction! Feel free to reach out with a message if you have any questions beyond that! :)