For Math support, go to www.greatminds.org and sign up for an account. You can receive parent support on math topics!
For ELA they can login at https://my.mheducation.com/login. Ask their teacher for their account information! Also check out www.commonlit.org for a free account!
They can also use https://www.zearn.org for math or https://www.mobymax.com/signin for different subjects!