Copy work. Use Bible or similar. Work up to longer passages. Letters must be well formed. Work must match exactly.
Math. Stretch attention span, but don’t push it too far.
Use an abacus for tactile math. There are some great Japanese sorobon workbooks. This teaches all that common core is attempting to do so poorly, but in a time tested and wonderful way.
If child is reading, they read for 30 min to 1-hour. They read aloud for 10-minutes. Dr. Seuss Books work wonderfully, especially for speech issues!