For basic algebra, Dragon Box Algebra is nice. My five year old has gone through that and is working his way through geometry and the algebra 12+. (He just pla

For basic algebra, Dragon Box Algebra is nice. My five year old has gone through that and is working his way through geometry and the algebra 12+. (He just plays occasionally - iPad time is weekends only and he chooses what he wants to do.) It’s mentally taxing, so I encourage him to switch to a different game when he starts getting fatigued. (It rewards by gradually drawing a monster and unlocking more skills.) For assembly, you could try “human resource machine”, but it gets hard too quickly. Light Box Jr might be more appropriate, though. ScratchJr is also worth checking out (it is more open ended rather than just gameplay).