Ok so I am posting for my mum here, but basically my brother has ADHD and has a hard time using Google Classroom because his work gets lost and can't prioritise tasks for the week.
Then mum found this tool called Kumo Study that is made for students with ADHD. It has a task timer (based on the Pomodoro timer) and a weekly task list where you can sit down with your child and allocate tasks/homework to each day of the week and even set how long to spend on each task.
There is also a site blocker where you can block distraction websites like Netflix, so you have confidence when you walk away from your computer screen that your child can't access distraction sites.
I don't know if you are allowed to advertise on here but the tool is free to use anyway. It is called Kumo Study and you can find it: kumostudy.com