I think every child is different, as parents, we do know them well, then we can try to help them . Some children will have to do some extra work at home to help them reinforce what they learn at school, some don't. Some child never need spelling practice, because they just look at it and then remember it, but some child may need practice to remember.
So it really depends on the child, what he/she need?
Generally, reading with DC, encourage DC writing( DS2 loves writing, I used to help him make it into books and now he likes to type it in computer). Discussing interesting topic( DS2 has a map on his wall which he likes to test me to find different places). We have some science and history books, he reads a lot and would ask lots of questions. For math, DS2 is doing well at school, so we only do some word qustion to get him to understand how to apply his math skill.
I do limit DS2's screen time, as for my DS2, if you don't limit, he will play games all the time. By set a time limit, when he is not allowed games and TV, he does think of ideas to play by himself.