Re your advice to parents on SATs, the best advice you can give them is: "SATs are only important for heads to improve their standings in the government imposed league tables."
As a diagnostic tool for identifying children's sterngths or weaknesses they are virtually useless. So don't allow yourselves to get sucked into the pseudo-importance agenda encouraged by schools. It just puts more pressure on your kids.
The only time they may affect your child's future is in Y9. Many secondary schools use these Key Stage 3 results to group pupils in sets. So if you want your child to be in a "top" set, then encourage them to work hard for those SATs.
But in general the word is:"SATs suck!"